Removed css option. Added list and exception option.

Replaced the css option with list. Can now list all files of the given type.
Ex)
cosa -l css
	will list all css files
cosa -l js
	will list all js files

Added the exception option, which allows you to automatically add exceptions to a
given config file. Not fully implemented.
Fixed links not being added to the links table.
Updated gemspec
Merge branch 'refactor' of https://github.com/bsuweb/cosa into refactor