Switched to gestalt-module 1.2.0
Fixed asset resolvers.
Merge pull request #1157 from MovingBlocks/fix-asset-resolvers

Fixed asset resolvers
Updated to use gestalt-module 1.2.1 with fix for OSX
Merge pull request #1159 from immortius/develop

Updated to use gestalt-module 1.2.1 with fix for OSX
Fixed sorting of modules in the SelectModulesScreen.
Updated to gestalt-module 1.2.2 to address unit testing bug.
Renamed engine's module.txt to avoid confusion.