many changes, added progress support
API changes, added request configuration object
more block related changes
added auth support
Merge branch '1.1' of github.com:cbot/KSDataDownloader into 1.1

Conflicts:
	Classes/ios/KSDataDownloader.h
	Classes/ios/KSDataDownloader.m
	Classes/ios/KSDataDownloaderTask.h
	Classes/ios/KSDataDownloaderTask.m