Bug 1019698: Add TB v2.2.5 lib

This is a combination of 4 different parts such as:

Part1: TB v2.2.5 lib provided by Tokbox
Part2: TB v2.2.5 lib tweaks to make it work for FxOS
Part3: Use TB v2.2.5 lib
Part4: Opentok helper
Merge pull request #11 from jaoo/1019698

Bug 1019698 - Add TB v2.2.5 lib. r=borjasalguero