added categories table
added categorizations table
user can create cat with tags
User can edit a cat's categorizations

delete duplicate submit cat test
rename tests for consistency
user can view categories pages and category index
Admin can delete scandalous cat tags
merge in pagination
removed focus: true from tests
added css classes to category show page
merged in pagination master
fixed typo in last commit
tests passing
merge with recent amazon

Merge branch 'master' into CATegorize
removed save and open page from spec
Specify default values for missing ENV vars.

Allows us to run rake without it crashing if the AWS keys aren't
set.
Remove extra instance variable for cats/show view.

Can access categories directly from the cat model.
Extract common behavior outside of if/else branch.
Add categorizations without removing existing ones
Avoid explicitly setting tag_string for cats.

This is set automatically as part of the form. When the `save`
method is called it should assign the categorizations.
added presence validations to categorization