Revert "update gems"

This reverts commit 1f8bed5.

Commit broke images, reverting until solution found

Author: frankharkins

Gemfile

@@ -1,8 +1,8 @@
 source 'https://rubygems.org'
 
 group :jekyll_plugins do
-  # gem 'github-pages'
-  gem 'jekyll-feed', '~> 0.15.1'
+  gem 'github-pages'
+  gem 'jekyll-feed', '~> 0.6'
 
   # Textbook plugins
   gem 'jekyll-redirect-from'
@@ -13,9 +13,9 @@ end
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 
 # Performance-booster for watching directories on Windows
-gem 'wdm', '~> 0.1.1' if Gem.win_platform?
+gem 'wdm', '~> 0.1.0' if Gem.win_platform?
 
 # Development tools
-gem 'guard', '~> 2.18.0'
+gem 'guard', '~> 2.14.2'
 gem 'guard-jekyll-plus', '~> 2.0.2'
 gem 'guard-livereload', '~> 2.5.2'

Gemfile.lock

@@ -1,37 +1,106 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.0)
+    activesupport (4.2.11.1)
+      i18n (~> 0.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
+    addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
-    bibtex-ruby (6.0.0)
+    bibtex-ruby (4.4.7)
       latex-decode (~> 0.0)
-    citeproc (1.0.10)
+    citeproc (1.0.9)
       namae (~> 1.0)
-    citeproc-ruby (1.1.14)
+    citeproc-ruby (1.1.10)
       citeproc (~> 1.0, >= 1.0.9)
-      csl (~> 1.6)
-    coderay (1.1.3)
+      csl (~> 1.5)
+    coderay (1.1.2)
+    coffee-script (2.4.1)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.11.1)
     colorator (1.1.0)
-    concurrent-ruby (1.1.9)
-    csl (1.6.0)
+    commonmarker (0.17.13)
+      ruby-enum (~> 0.5)
+    concurrent-ruby (1.1.5)
+    csl (1.5.0)
       namae (~> 1.0)
-      rexml
-    csl-styles (1.0.1.11)
+    csl-styles (1.0.1.9)
       csl (~> 1.0)
-    em-websocket (0.5.2)
+    dnsruby (1.61.3)
+      addressable (~> 2.5)
+    em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
+    ethon (0.12.0)
+      ffi (>= 1.3.0)
     eventmachine (1.2.7)
-    ffi (1.15.4)
-    formatador (0.3.0)
+    execjs (2.7.0)
+    faraday (0.17.0)
+      multipart-post (>= 1.2, < 3)
+    ffi (1.11.1)
+    formatador (0.2.5)
     forwardable-extended (2.6.0)
-    guard (2.18.0)
+    gemoji (3.0.1)
+    github-pages (202)
+      activesupport (= 4.2.11.1)
+      github-pages-health-check (= 1.16.1)
+      jekyll (= 3.8.5)
+      jekyll-avatar (= 0.6.0)
+      jekyll-coffeescript (= 1.1.1)
+      jekyll-commonmark-ghpages (= 0.1.6)
+      jekyll-default-layout (= 0.1.4)
+      jekyll-feed (= 0.11.0)
+      jekyll-gist (= 1.5.0)
+      jekyll-github-metadata (= 2.12.1)
+      jekyll-mentions (= 1.4.1)
+      jekyll-optional-front-matter (= 0.3.0)
+      jekyll-paginate (= 1.1.0)
+      jekyll-readme-index (= 0.2.0)
+      jekyll-redirect-from (= 0.14.0)
+      jekyll-relative-links (= 0.6.0)
+      jekyll-remote-theme (= 0.4.0)
+      jekyll-sass-converter (= 1.5.2)
+      jekyll-seo-tag (= 2.5.0)
+      jekyll-sitemap (= 1.2.0)
+      jekyll-swiss (= 0.4.0)
+      jekyll-theme-architect (= 0.1.1)
+      jekyll-theme-cayman (= 0.1.1)
+      jekyll-theme-dinky (= 0.1.1)
+      jekyll-theme-hacker (= 0.1.1)
+      jekyll-theme-leap-day (= 0.1.1)
+      jekyll-theme-merlot (= 0.1.1)
+      jekyll-theme-midnight (= 0.1.1)
+      jekyll-theme-minimal (= 0.1.1)
+      jekyll-theme-modernist (= 0.1.1)
+      jekyll-theme-primer (= 0.5.3)
+      jekyll-theme-slate (= 0.1.1)
+      jekyll-theme-tactile (= 0.1.1)
+      jekyll-theme-time-machine (= 0.1.1)
+      jekyll-titles-from-headings (= 0.5.1)
+      jemoji (= 0.10.2)
+      kramdown (= 1.17.0)
+      liquid (= 4.0.0)
+      listen (= 3.1.5)
+      mercenary (~> 0.3)
+      minima (= 2.5.0)
+      nokogiri (>= 1.10.4, < 2.0)
+      rouge (= 3.11.0)
+      terminal-table (~> 1.4)
+    github-pages-health-check (1.16.1)
+      addressable (~> 2.3)
+      dnsruby (~> 1.60)
+      octokit (~> 4.0)
+      public_suffix (~> 3.0)
+      typhoeus (~> 1.3)
+    guard (2.14.2)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
       lumberjack (>= 1.0.12, < 2.0)
       nenv (~> 0.1)
       notiffany (~> 0.0)
-      pry (>= 0.13.0)
+      pry (>= 0.9.12)
       shellany (~> 0.0)
       thor (>= 0.18.1)
     guard-compat (1.2.1)
@@ -44,86 +113,197 @@ GEM
       guard (~> 2.8)
       guard-compat (~> 1.0)
       multi_json (~> 1.8)
+    html-pipeline (2.12.0)
+      activesupport (>= 2)
+      nokogiri (>= 1.4)
     http_parser.rb (0.6.0)
-    i18n (1.8.10)
+    i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (4.2.1)
+    jekyll (3.8.5)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 1.0)
-      jekyll-sass-converter (~> 2.0)
+      i18n (~> 0.7)
+      jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 2.0)
-      kramdown (~> 2.3)
-      kramdown-parser-gfm (~> 1.0)
+      kramdown (~> 1.14)
       liquid (~> 4.0)
-      mercenary (~> 0.4.0)
+      mercenary (~> 0.3.3)
       pathutil (~> 0.9)
-      rouge (~> 3.0)
+      rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-      terminal-table (~> 2.0)
-    jekyll-feed (0.15.1)
+    jekyll-avatar (0.6.0)
+      jekyll (~> 3.0)
+    jekyll-coffeescript (1.1.1)
+      coffee-script (~> 2.2)
+      coffee-script-source (~> 1.11.1)
+    jekyll-commonmark (1.3.1)
+      commonmarker (~> 0.14)
       jekyll (>= 3.7, < 5.0)
-    jekyll-redirect-from (0.16.0)
-      jekyll (>= 3.3, < 5.0)
-    jekyll-sass-converter (2.1.0)
-      sassc (> 2.0.1, < 3.0)
-    jekyll-scholar (7.0.0)
-      bibtex-ruby (~> 6.0)
+    jekyll-commonmark-ghpages (0.1.6)
+      commonmarker (~> 0.17.6)
+      jekyll-commonmark (~> 1.2)
+      rouge (>= 2.0, < 4.0)
+    jekyll-default-layout (0.1.4)
+      jekyll (~> 3.0)
+    jekyll-feed (0.11.0)
+      jekyll (~> 3.3)
+    jekyll-gist (1.5.0)
+      octokit (~> 4.2)
+    jekyll-github-metadata (2.12.1)
+      jekyll (~> 3.4)
+      octokit (~> 4.0, != 4.4.0)
+    jekyll-mentions (1.4.1)
+      html-pipeline (~> 2.3)
+      jekyll (~> 3.0)
+    jekyll-optional-front-matter (0.3.0)
+      jekyll (~> 3.0)
+    jekyll-paginate (1.1.0)
+    jekyll-readme-index (0.2.0)
+      jekyll (~> 3.0)
+    jekyll-redirect-from (0.14.0)
+      jekyll (~> 3.3)
+    jekyll-relative-links (0.6.0)
+      jekyll (~> 3.3)
+    jekyll-remote-theme (0.4.0)
+      addressable (~> 2.0)
+      jekyll (~> 3.5)
+      rubyzip (>= 1.2.1, < 3.0)
+    jekyll-sass-converter (1.5.2)
+      sass (~> 3.4)
+    jekyll-scholar (5.16.0)
+      bibtex-ruby (~> 4.0, >= 4.0.13)
       citeproc-ruby (~> 1.0)
       csl-styles (~> 1.0)
-      jekyll (~> 4.0)
+      jekyll (~> 3.0)
+    jekyll-seo-tag (2.5.0)
+      jekyll (~> 3.3)
+    jekyll-sitemap (1.2.0)
+      jekyll (~> 3.3)
+    jekyll-swiss (0.4.0)
+    jekyll-theme-architect (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-cayman (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-dinky (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-hacker (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-leap-day (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-merlot (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-midnight (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-minimal (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-modernist (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-primer (0.5.3)
+      jekyll (~> 3.5)
+      jekyll-github-metadata (~> 2.9)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-slate (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-tactile (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-time-machine (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-titles-from-headings (0.5.1)
+      jekyll (~> 3.3)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (2.3.1)
-      rexml
-    kramdown-parser-gfm (1.1.0)
-      kramdown (~> 2.0)
-    latex-decode (0.3.2)
-    liquid (4.0.3)
-    listen (3.7.0)
-      rb-fsevent (~> 0.10, >= 0.10.3)
-      rb-inotify (~> 0.9, >= 0.9.10)
-    lumberjack (1.2.8)
-    mercenary (0.4.0)
-    method_source (1.0.0)
-    multi_json (1.15.0)
-    namae (1.1.1)
+    jemoji (0.10.2)
+      gemoji (~> 3.0)
+      html-pipeline (~> 2.2)
+      jekyll (~> 3.0)
+    kramdown (1.17.0)
+    latex-decode (0.3.1)
+    liquid (4.0.0)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    lumberjack (1.0.13)
+    mercenary (0.3.6)
+    method_source (0.9.2)
+    mini_portile2 (2.5.0)
+    minima (2.5.0)
+      jekyll (~> 3.5)
+      jekyll-feed (~> 0.9)
+      jekyll-seo-tag (~> 2.1)
+    minitest (5.13.0)
+    multi_json (1.14.1)
+    multipart-post (2.1.1)
+    namae (1.0.1)
     nenv (0.3.0)
+    nokogiri (1.11.1)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
+    octokit (4.14.0)
+      sawyer (~> 0.8.0, >= 0.5.3)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    pry (0.14.1)
-      coderay (~> 1.1)
-      method_source (~> 1.0)
-    public_suffix (4.0.6)
-    rb-fsevent (0.11.0)
-    rb-inotify (0.10.1)
+    pry (0.12.2)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
+    public_suffix (3.1.1)
+    racc (1.5.2)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
       ffi (~> 1.0)
-    rexml (3.2.5)
-    rouge (3.26.1)
+    rouge (3.11.0)
+    ruby-enum (0.7.2)
+      i18n
+    ruby_dep (1.5.0)
+    rubyzip (2.0.0)
     safe_yaml (1.0.5)
-    sassc (2.4.0)
-      ffi (~> 1.9)
+    sass (3.7.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sawyer (0.8.2)
+      addressable (>= 2.3.5)
+      faraday (> 0.8, < 2.0)
     shellany (0.0.1)
-    terminal-table (2.0.0)
+    terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    thor (1.1.0)
-    unicode-display_width (1.8.0)
+    thor (0.20.3)
+    thread_safe (0.3.6)
+    typhoeus (1.3.1)
+      ethon (>= 0.9.0)
+    tzinfo (1.2.5)
+      thread_safe (~> 0.1)
+    unicode-display_width (1.6.0)
 
 PLATFORMS
-  x86_64-darwin-19
+  ruby
 
 DEPENDENCIES
-  guard (~> 2.18.0)
+  github-pages
+  guard (~> 2.14.2)
   guard-jekyll-plus (~> 2.0.2)
   guard-livereload (~> 2.5.2)
-  jekyll-feed (~> 0.15.1)
+  jekyll-feed (~> 0.6)
   jekyll-redirect-from
   jekyll-scholar
   tzinfo-data
 
 BUNDLED WITH
-   2.2.28
+   2.1.2