v2.0-beta.0

This is the beta version for the Release 2. The following was done in this release:
- Many Bug Fixes(commans in DB, Disable syntax chack whole saving a password,...)
- Enable phone calls
- Enable to upload presenations
- Display multiple formats
- Enable mp4 download in case available
- set the maximum number of participants
- set the maximum duration of the meeting
- Add a Guest link and a guest page