[WIP] Adds categories to tags - adds 'searches' scaffold with tags grouped by cat
Adds categories to tags
Lucas' suggestion
Merge branch 'master' into tag_categories

Conflicts:
	config/routes.rb
	db/schema.rb
Fixes tag_spec
Merge branch 'master' into tag_categories

Conflicts:
	app/models/user.rb
Merge pull request #25 from rhokbrisbane/tag_categories

Tag categories