[EE] Add rails version to all migrations

config/application.rb

db/migrate/20140313092127_init_schema.rb

db/migrate/20140407135544_fix_namespaces.rb

...131055_change_state_to_allow_empty_merge_request_diffs.rb

db/migrate/20140416074002_add_index_on_iid.rb

db/migrate/20140416185734_index_on_current_sign_in_at.rb

db/migrate/20140428105831_add_notes_index_updated_at.rb

db/migrate/20140502115131_add_repo_size_to_db.rb

db/migrate/20140502125220_migrate_repo_size.rb

db/migrate/20140611135229_add_position_to_merge_request.rb

db/migrate/20140625115202_create_users_star_projects.rb

db/migrate/20140729134820_create_labels.rb

db/migrate/20140729140420_create_label_links.rb

db/migrate/20140729145339_migrate_project_tags.rb

db/migrate/20140729152420_migrate_taggable_labels.rb

db/migrate/20140730111702_add_index_to_labels.rb

db/migrate/20140903115954_migrate_to_new_shell.rb

db/migrate/20140907220153_serialize_service_properties.rb

db/migrate/20140914113604_add_members_table.rb

db/migrate/20140914145549_migrate_to_new_members_model.rb