[fix] AnalyticsHelper beautification.
- Standardized singleton def + objc_arc warning
[fix] FacebookHelper beautification.
- Cleaned up singleton def.
- Added some debug logging.
- Removed ANDROID defs
[fix] WRImageCache
- Support AFNetworking 1.x or 2.x
- fix bug with NULL data check
[fix] WRInstallTrackerHelper cleanup
- standardized singleton def
- added ANDROID ifndef