Let camera size inherit from stage dimensions

I'm super appreciative that you forked the original project and got it to mirror. That's awesome! I ran into a hitch switching to your version, though. You've baked in the camera dimensions to the SWF file. I basically just copied how jQuery-webcam does this in the root repo into yours.

I don't have any way to compile AS myself or this wouldn't be a problem. But I was hoping you wouldn't mind merging this, recompiling the AS, and pushing the result? 

Thanks so much!