Merge branch 'Team-D-feature/4144-convert_ActivityStreamSPhoto_to_StatusMessages' into develop
fix #4163 - Now updating correct contact attribute on retraction

Added test case for Issue #4163
Merge branch 'L3MNcakes-4163-user-sharing' into develop
stabilize features/signs_up.feature
stabilize features/reshare_mobile.feature
hide other flash messages before showing a new one
fix ActivityStreams::Photo migration
Limit index key length when creating oembed caches
Refactor and reorder backbone app initialization, fixes hovercards

Also added cucumber feature for hovercards
bump unicorn
bump carrierwave
bump i18n-inflector
bump rails-i18n
bump twitter
bump omniauth-twitter
bump cucumber
bump guard
bump remotipart
bump addressable
bump fixture_builder