Merge pull request #214 from K-GmbH/bugfix

fixed issue with crashing erizoJS not recognized by controller
Changed KEEPALIVE variable name
Merge branch 'master' of https://github.com/ging/licode
Changed KEEPALIVE
Overwritten fix in basicExample
Updated mediaconstrains syntax
Fixed Firefox video compatibility
Temporary solution: we are forcing the session to use 120 as VP8 PT