Add tag validation and fuzzy search

[ambid17]

There needs to be a way to keep people from using several different tags for one category, this prevents the users searching from being able to find what they are looking for.

There needs to be some form of tag validation, such as underscore concatention (i.e. "mobile dev" goes to "mobile_dev")

If we don't do tag validation, then there needs to be a form of fuzzy search: (i.e. iOS search looks for: ios, ioS, apple, mobile, etc)