Send device name header to myPlex, fixes #245.
Only ever create a single object for each server, fixes #244.

When testing multiple connections, only create a single server object to
make sure that nothing is left holding a reference to the wrong instance.
Add interval to PMS BIF requests, fixes #246.

Hardcoded (well, hidden pref) to 10 seconds for now.
Fix crash on playback on 3.x firmware, fixes #247.
Rename transcoder options.

We don't quite seem ready to remove the option completely, but we can at least
make the universal transcoder seem less dangerous.
[Stable, Experimental] -> [Legacy, Universal]
Don't annotate video title once playback starts, fixes #248.
Allow audio player looping to be set from the springboard.
Bump version to 2.6.6 and add release notes.
Update Makefile and README for recent changes.

My Roku is now requiring authentication on installer requests.
Send the device name to PMS as well, for Now Playing.