Merge branch 'release/0.3.0' into develop
Adding base model
Fixing podfile errors
Marking old item methods as deprecated
Adding AEFBaseCollection class
Adding AEFTableCollection
Adding subscripting support to AEFBaseCollection

* Bonus count method to get collection object count
Implementing NSCopying in collection models
Removing depreacted data source logic

* Implementing table collection
Updating docs
Updating table row example
Adding objectAtIndex: method to base collection
Adding AEFTableSectionCollection class

* Adding new class for sectioned table data sources
Adding default cell identifier

* Adding a default cell identifier when a table collection is
  created with no cell identifier set
Returning seciton objects by indexPath

* Optimizing all the things
Associating objects with cell identifiers

* Adding method to table section colleciton to get cell identifier
  associated to an object at a given indexPath
Fixing docs typo
Moving cell identifier association to table collection
Adding method to add objects to a section
Appending to empty sections instead of raising exception