adding correct branch of submodule

Siddharth Ancha · Siddharth Ancha · commit 01fa57cfd1a1 · 2016-03-21T18:13:46.000-04:00
diff --git a/.gitmodules b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "stan"]
+	path = stan
+	url = https://github.com/siddancha/stan.git
+	branch = develop
diff --git a/stan b/stan
@@ -0,0 +1 @@
+Subproject commit 45aecfd1a75ca93be54e2e922d5e0fb9d076bf0c
