Working on network manager.
Added pixi to vendor loader.
Additional work on NetworkManager.
Finished merge.
added density, friction and restitution to Rectangle.js
Added step call to update method in PhysicsSystem.js
Starting to integrate Network Manager into Scene.
Merge branch 'master' into josh_network_manager
Only start Network Manager when in main window - not when in WW.
Starting to add 'host' logic.
Network manager now supports probing for host, becoming host, and propagating connections as the host.
Merge branch 'master' into josh_network_manager
Merge branch 'master' into josh_network_manager
Merge branch 'master' into Justin
Detect disconnections.
Refactoring for some readability (extracting methods).
Created physics world in scene.  fixed syntax of some box2d calls
Some comment clarifications.
Better way to detect if in a web worker.
Externs for peer generated by Joe.