Added HeartbeatHandler framework and simple test in sample.py
Currently just sends heartbeat to server on a 15 second timer
Merge remote-tracking branch 'remotes/origin/develop' into steve
Merge branch 'develop' into steve
Added information to heartbeat and stored clientID temporarily in web socket
Added Redis support for storing heartbeat timestamp by clientID
Fixed heartbeat.py conflict
Fixed bugs in heartbeat code and added common messaging format to responses
Moving log statements to debug. Setting logging level to info. Renamed variables for PEP8 compliance.
More heartbeat and interview handler formatting fixes
String formatting fixes in heartbeat.py
Fixed error checking for interview_id
Merge pull request #19 from jivid/steve

Re-added heartbeat code, and added redis storage for heartbeat data
Merged dev, resolved conflicts. Added logging into Steve's changes.
Made PEP8 fixes.