Basic JSON parsing & object storage (in memory) now working.
Merge branch 'develop' into feature/challenges_Webservice

Conflicts:
	gbk/gbk/GBKAppDelegate.m
	gbk/gbk/Source/API/GBKApiManager.h
	gbk/gbk/Source/API/GBKApiManager.m
Rough cut of imageLoader - basically working.
added file caching to image loader.
Merge branch 'develop' into feature/challenges_Webservice

Conflicts:
	gbk/gbk/GBKAppDelegate.m
	gbk/gbk/Source/API/GBKApiCommunicator.h
	gbk/gbk/Source/API/GBKApiManager.m
re-did my changes after merge.
Merge branch 'feature/challenges_Webservice' into develop