Engine Stepping

This morning I was able to add a small bit of code that allows a developer to step the engine a frame at a time when the metrics panel is being displayed.  I plan to use this to profile single steps of the engine to find areas where large sums of time are being spent.  I also have a fix, from last night, that I thought I committed (but didn't) which cleans up some things, enables native frame requests, fixes IE9, fixes a bug in pooling, and also deprecates set- and getHostObject() in favor of set- and getGameObject().