Added pull-to-refresh support and infinite scrolling
Merge branch 'master' of https://github.com/s-halford/ios-exercises

# By Falko Buttler
# Via Falko Buttler
* 'master' of https://github.com/s-halford/ios-exercises:
  Fixed issue with deleting images

Conflicts:
	Blocstagram/Blocstagram/Blocstagram/BLCImagesTableViewController.m