Changed regex to insensitive, and added a function to retain the case of the original source.
Clean up the code a little
Added closure to make things a little faster
failed merge
added configuration pag from chrome extensions example
Merge branch 'prtinsley-case-insensitive-match'

Conflicts:
	substitutions/js/substitutions.js
Merge branch 'small_improvements' of https://github.com/dragulceo/xkcd-substitutions into dragulceo-small_improvements

Conflicts:
	substitutions/js/substitutions.js
Merge branch 'master' of github.com:Posnet/xkcd-substitutions

Conflicts:
	substitutions/js/substitutions.js