Moved dispatch_async( dispatch_get_main_queue() to RequestManager from all ViewControllers (expert review part 2).
Set readonly for some property.

Added design for our application:
	- create category for UIViewController which sets background image.
	- we set font and background color for cells and headers.
	- added new images.
Clear our code.
Merge remote-tracking branch 'origin/master'
Fixed bugs with github’s conflicts.