Major rewrite

[jimmywarting]

This is a major rewrite that makes fake blobs at least more useful and also do some repairing.

• first it checks if blob construction works
• then check if Blob constructor supports ArrayBufferViews (cuz safari have problem with it, so it fix that with a new constructor)
• if none of those two works: It tries fix a new blob constructor (one witch use the existing Blob constructor and the other using BlobBuilder)
• if there is still a problem creating a blob then it reimplements FileReader, Blob, File, URL, patches XHR so it sends blob as a string
• if not not everything is reimplemented then it tries to fix the new File constructor so it works in every browser including all ie version and edge and some old safari versions. after that it also fixes IE's problem with not correctly setting the request Content-Type header to blob's type

It has been tested in all IE8 to 11, and Safari 6 to 11.1 that have problem with creating new File blobs and not being able to send blobs properly with xhr

Thanks to BrowserStack

I wrote it in plain old ES3 so no transpiling or browserify is needed.

closes #44
closes #33
maybe #53
maybe #19
maybe #45