Added support for client subing with last_seen
Fix tests
Refactor so RedisChannel subclasses InMemoryChannel
Refactor class names
Redis tests now also pass
Add YAML parameter and install redis on Travis
Install redis server in correct place
Start redis server
Add integration test
Tests use simulate script
Add missing import
Attempt to get travis to run
Add ws4py to normal requirements in an attempt to get Travis to install it
Softcode paths
check return code
Merge branch 'feature/last_seen_by_client' into develop