v0.3.3 Fixed issue in FF disconnecting after a few seconds

FF seems to GC data channels which should not be GC'd. Added
a hard reference to further signal that these channels are
still in use. Will investigate further to see if this was an
implementation error on my part, or if FF actually has a bug
which needs to be addressed.

v0.3.2 - Bring up to latest WebRTC standards

The standards have changed since this library was released last
year. Most of the changes seem to be in how things are configured
this update brings P closer to the current standards. A side-effect
seems to be that it now works more reliably in Firefox as well.