change name of tests class to FileReceiverProtolTests
cleaning up the docstrings
changed names to reflect PeerDiscovery module
replace import jjson with from json import object syntax
Cleaned up PeerDiscoveryProtol

Changed the name of the protocol and it's message to reflect
the module in which they live.

Also, shortened line lengths. Still need to work on the docstrings
but that will wait.

Merge branch 'cleanup_peerdisc' into file_send_message
Merge pull request #5 from derwolfe/file_send_message

File send message