Add tag model and migrations; Update item views to incorporate tags (categories)
Add category column to items_in_stock form
Add default value for category
Remove controllers from spec

We have spec/requests, don't need controllers
Updated item_spec request tests to all pass. Added the annotate gem and added the
schema annotation to the model classes.
Add views and request tests for tags.
Allow blank tags when creating a new item
Merge pull request #27 from ryanthames/add-tags

Add tags