Bug 988404 - Call screen
Merge pull request #8 from jaoo/988404

Bug 988404 - Call screen. r=borgasalgero
Bug 1019698 - Part1: TB v2.2.5 lib provided by Tokbox
Bug 1019698 - Part2: TB v2.2.5 lib tweaks to make it work for FxOS
Bug 1019698 - Part3: Use TB v2.2.5 lib
Bug 1019698 - Part4: Opentok helper