Serve time values in milliseconds

Right now, diamondash's server gives time values (datapoints, poll interval, bucket sizes, etc) in seconds. JS things commonly expect time values in milliseconds, so right now we are needing to multiple by 1000 all over the place.

Diamondash's server side needs to be changed to provide time values in milliseconds. This will simplify working with time values on the client side, and keep more of the data mangling on the server side.