Revision 2:

Changes:
-added support for Firefox getUserMedia apis
-fixed a race condition seen in Firefox 21 (thanks to jkolivas for noticing this and suggesting a fix!)
-merged commits from ryanramage (thanks!):
  -commonjs/amd package support
  -grunt.js build tools
Add Snake to Projects that have used headtrackr

I also add some explaination to my demo ;)
Fix typo in realisticRelativeCameraControl
Merge commit 'refs/pull/14/head' of https://github.com/auduno/headtrackr into dev

Conflicts:
	README.md
Merge commit 'refs/pull/15/head' of https://github.com/auduno/headtrackr into dev

Conflicts:
	README.md
Rebuilt minified headtrackr.js

Rebuilt headtrackr.js & headtrackr.min.js with fixed typo from
tylermauthe