Reintroduced _settings.PPWSrc, so it only needs to be worked out once
Merge pull request #62 from MartijnRas/master

"Reintroduced _settings.PPWSrc, so it only needs to be worked out once"
:)
Merge branch 'remote'

Added server features to load power polygon via nodejs.
Some of the new features:
- Added root page with the list of talks, login button, and option to present the talks remotelly;
- Added full remote control;
- Added basic remote control;
- Use of websockets to manipulate the presentation;
- Use of session and tokens to lock the presenter to the attendees;
Added a better style to mobile visualization of the basic control for small devices
Added support to forward and backward commands on basic remote control
Adding the canvas to the remote control
- Added thumbnail/go-to to the full remote controll;
Added drawing and spotlight to full remote control;