index: rename getContact() argument to jid for consistency

index: rename model to contact for clarity

contacts: create Entities collection, replace capscache

index: rename model to contact for clarity

index: serverInfo.set('carbons') is already done in enableCarbons()

index: start saving settings only after everything has finished loading

calls: make in-call controls one fixed size

calls: add hangup button to video element itself

index: show an unread messages indicator in document title

coffee: update compiler to 1.12.2, recompile