Add update columns migration
Update db  schema
Remove needless tables from this branch
Refactor migration
modified validation with allow_blank
added failing test
fixed select of repeating items in tagged_with
Merge pull request #38 from ILoGM/feature-37-not-null-ids

Feature #37 not null ids
Merge pull request #44 from monshq/feature-42-preserve-blank-msg

Feature #42 modified validation with allow_blank
Merge pull request #46 from monshq/feature-45-multiplying-items

Feature #45 multiplying items
Add rolify gem
Generate Role model
Modify models for rolify
Add authority gem
Generate authority
Modify models for authority
Update application controller
Update auth view and User model
Add home authorizer
Add test users controller