Fixing category column name in resources#index page
Including validation to Tag model
Fixing specs
Creating Category model + fixing tags db table with old categories
Including the 'bullet' gem
Fixing query N+1
Cleaning code
Sorting routes
Category CRUD
Merge branch 'master' into t12121-tag-categories

Conflicts:
	config/routes.rb
Merge pull request #69 from rhokbrisbane/t12121-tag-categories

T12121 tag categories