Fix for embedding code from github
Add option for custom js (like custom css)

* Add a new 'js' flag to indicate you want to embed a file named 'custom.js'
  which should exist at the root of the wiki
[[_]] float clearing tag experiment
Move gollum back end to gollum-lib #647
Merge pull request #662 from lemonsqueeze/clearfloats

[[_]] float clearing tag experiment
Fix style
Merge branch 'master' into feature/gollum-lib

Conflicts:
	lib/gollum/markup.rb
Merge pull request #661 from simonista/custom-js

Add option for custom js (like custom css)
Update README.md
Update README.md
Merge pull request #660 from simonista/fix-github-links

Fix for embedding code from github
Merge branch 'master' into feature/gollum-lib

Conflicts:
	lib/gollum/markup.rb
	test/test_gitcode.rb
Merge pull request #664 from jamieoliver/feature/gollum-lib

Move gollum back end to gollum-lib #647
Update gemspec
Tweak TeX math delimiters.
Merge pull request #667 from cpence/master

Tweak TeX math delimiters
Update MathJax docs
README mention of gollum-lib and whitespace fixes
Syntax highlighting in README
Upgrade to sinatra 1.4