Add sample project
Add SDFFlickrRecentPhotosModel and SDFFlickrPhoto
Basic SDFFlickrExploreViewController configuration
Add model to SDFFlickrExploreVC
Add default DFImageManagerConfiguration (not complete implementation)
DFImageManagerConfiguration basic implementation
Move sample project
Integrate DFImageManager into sample project
Podfile now uses local path to DFImageManager
Complete integration
Sample works
Add DFImageFetchConnectionOperation
Add DFImageFetchConnectionOpertation