add csslint support
adding handling of old git configuration format
add tests for reading old checks
Merge pull request #111 from jish/bugfix/migrate_old_git_config

Git configuration should be backwards compatible
fixing descriptions
remove rubinius support, it only causes problems
Merge branch 'master' into features/csslint

Conflicts:
	test/unit/pre-commit/cli_test.rb
Merge pull request #18 from jish/features/csslint

Add CSS lint support