Per issue #13. Initial pass at allowing listCompetitions API call.
Merge branch 'develop' into list_competitions

Conflicts:
	BNGAPI/BNGAPI.xcodeproj/project.pbxproj
	BNGAPI/BNGAPI/Classes/BNGAPIResponseParser.h
	BNGAPI/BNGAPI/Classes/BNGAPIResponseParser.m
Per issue #13. Listing competitions. Unit tests and parsing.