messages: rename rivets.bind() parameter

coffee: update compiler to 1.12.1, recompile

Makefile: use ampersand in sed expression to refer to the whole string

contacts: only count unread for the exact jid

contacts: show the number of incoming messages in a badge

views: save nested AvatarView, and then dispose of it in remove()

calls: use parens for one-line function calls

calls: rename enableTracks() to toggleTracks(), since it takes a state arg

index: don't use rivets to update src attribute of <video> elements Changing this attribute twice in a row is bad and shouldn't happen, and we're already setting it in the view (so we can call el.play() immediately afterwards).

pipelines: making grep quiet is actually not helpful at all