Add tag index page
Clear up tag pages
Add editing tags and handling of non-existent tags
Add handing of existing tags
Handle slug creation
Make all tags lower case
Send back the other errors properly
Update navigation links
Update features to run faster
Update gig page
Speed up tests
Reword tag features to be more descriptive
Reword blog features to be grammatically correct
Reword "I create a user" to "There is a user"