Added DVD's section and other rewrite

* Added SDWebImage to handle async image loading, caching etc.
* Moved tab bars to movies view controller
* Now using single view to load both Box office and DVD's data
* Moved around logic to set which tab is selected and load data
  accordingly for that tab
* Loading indicator now shows when data is being fetched (not just
  at start)
* Added error handling for broked API reponse/network errors
Pod cleanup
Fixed network error dialouge
Updated read
Updated readme to new format