Store the packed version of sequenced messages
Better handling of rollovers
Fire messages as they are sent. This eliminates the bundling up of data channel messages which results in the frequent frags. Now only single datachannel messages that are large are fragged.
Merge pull request #572 from apathyboy/network_fixes

Network Fixes. Special thanks to Light for pointing out the issues.
Merge remote-tracking branch 'anh/develop' into develop