now we sign_in user and show a welcome back message during reactivation
Merge pull request #758 from diogob/login_after_reactivation

now we sign_in user and show a welcome back message during reactivation
commented this spec (I think that he's using drugs)
removed schema_associations from channel related models
removed schema_associations from contribution, notification, payment_notification, project and project_post
removed scham_associations from remaining models
removed schema_associations from gemfile
upgraded Rails to 4.1.4
Merge pull request #759 from diogob/byebye_schema_associations

Byebye schema associations
added user_notifier gem and its configuration
adding user notification using the UserNotifier gem and moving some templates to be used by the gem
removed unused User#notify method
moved user_deactivate notification template
moved credits warning templates and fixed user_deactivate subject template
fixed observer spec
fixed user notifications
created contribution_notifications table
migrated notify calls to user_notifier gem, still need to migrate templates
moved payment_slip templates
moved refund_completed and refund_completed_slip templates