Now, persistent rooms will be really persistent (never deleted), but can only be set by an admin
Rooms with an owner password set are now called "reserved" room, and works as before
Since Chrome 34, a new API for screen sharing is available (the previous one using the flag will probably be deprecated soon)
This commit adds:
- Source of a simple Chrome extension to use this new API (which is a perfect copy of the sample extension given by &yet here: https://github.com/HenrikJoreteg/getScreenMedia
- Adapt help page
- New modal dialog to prompt user to install the extension from Google Web Store
- Better error messages if you can't share your screen
Should fix#7