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 a messa showing user that he have credits before create a contribution [13273001]
Merge pull request #761 from devton/feature/add_credits_message_on_new_contribution-13273001

added a messa showing user that he have credits before create a contribu...