Installs SimpleForm and uses it to replace newsletter form and add categories checkboxes to it. Fixes specs so all is green.
Adds Categories to nav and replaces categories scaffolded views with Twitter bootrapped ones
Fixes a spec
Adds uniqueness validation on Category name and fixes other specs
Adds Rspec support for :focus tag
Scaffolds Subscribers with email and auth_token and specs and bootstrap and all
Creates HABTM relationship between Categories and Subscribers and adds checkboxes to subscriber form
Updates locales
Adds I18n support for categories/newsletters/subscribers create/update/destroy operations notices
Adds name to subscriber and removes auth_token from views
Fixes bug with newsletter's category validation & adds I18n support for error message