redding/deas-erbtags — pull request #21 by kellyredding (2013-05-21 19:41:14+00:00)
Title: util to help insert new class strings into an existing class string

In a nice funtional way. Just a helper util.

@jcredding ready for review. Do you know a better way to append the new classes to the set other than with the `each` implementation I did? Thanks.