allow initialization with a custom nib name when one class controls multiple nibs
Remove initializers, only use registration methods to add cells
Formatting
Reimplement custom nib name, format and refactor
Initial apple doc comments
Add assertions for required params
Merge branch 'development' into feature/ndonald2/deprecate-initialization

Conflicts:
	RZCellSizeManager/RZCellSizeManager.m
documentation fix
Merge pull request #9 from Raizlabs/feature/ndonald2/deprecate-initialization

Deprecate multiple init methods in favor of registration methods