Updating to latest version of firebase.
Reversing order of chat messages.
Making it easy to reverse messages
Updating readme with info for variable table height and reversing messages.
Renaming reverse to newMessagesOnTop. Also made the chatroom more performant on initial load.
enable variable table row heights.

long sentences were being truncated, making it impossible for
users to see what was said. now they are word wrapped.
Merge branch 'variableheight' into HEAD