index: show an unread messages indicator in document title

coffee: update compiler to 1.12.2, recompile

index: flex message area, reserve some height

index: scroll chatlog to bottom on outgoing message

index: flex contact list, reserve some height

messages: scroll chatlog to bottom if it was at the bottom already

index: make contact list + messages cooperate height-wise with call container

index: make main container have at least 100% height

index: add bottom margin for .input-groups

provision: skip generating a custom dhparams file to save on deployment time