Add privileged and certified apps to webidl checker.
Add privileged app.
Change marionette version in setup.py
Use install_app from fxos-appgen
Address review comments
Merge pull request #52 from dminor/webidl-permissions

Add privileged and certified apps to webidl checker.
Fix typo that prevented omni analyzer from running; update docs
More doc updates
Update docs on running WebAPI tests
More doc updates