Send recent data on initial connect for raw xml connections.
Move delay-till-next-update calculation from javascript to python.
Convert serial monitor function into its own class.
Show error message: on their own, at the top, in red.
Add Google Chart visualization of historic energy consumption.
Add install instructions for gviz-api for Debian.
Protect all access of readings with readings_lock.
Update example config for cosm to xively rename.