Rename: unicorn.rb.orig --> unicorn.rb.example

Updated development docs

Renamed unicorn.rb.orig to unicorn.rb.example since this seems to be more in line with the common used naming in the config directory. Plus seeing *.orig files I think of the leftovers of git merges, which left me puzzled for quite some time.

Merge branch 'change-notes-order' of https://github.com/riyad/gitlabhq into riyad-change-notes-order

Repaired Get patch

Fix HTML entities being parsed in GFM

Also fixes the spec so that it actually tests the thing it says it's
testing. Hooray!

Closes #1308