Add ability to upload log files from client to server

[kylemhall]

Right now the Libki client generates logs, but there is no automatic way to access them. It would be great to either:
A) Upload the log files to the Libki server
and/or
B) Stream the logging statements to the server live

A is more complicated, B would cause far more network activity.
For B, we could implement logging levels on the server side that the client could read and then log the appropriate level.