Update to 0.3.0

* Enhancements to the Collapse extension
    * `CollapsibleTableViewController` integrates with Core Data out-of-the-box.
       One only needs to replace the default `TLIndexPathController with an
  instance initialized with an `NSFetchRequest`.
    * Add `TLCollapsibleDataModel` initialize that takes a collection
      of expanded section names (instead of collapsed section names)
* Add completion handler to `performBatchUpdatesOnTableView`
* Add `TLDynamicHeightLabelCell` extension, a simple table view cell
  implementation supporting a single dynamic height label
* Modified items are now reloaded in `performBatchUpdatesOnCollectionView`
* Add ability to pause and unpause fetch results updates by setting the
  `ignoreFetchedResultsChanges` property on `TLIndexPathController`
* The notification `TLIndexPathControllerChangedNotification` has been
  renamed to `kTLIndexPathControllerChangedNotification`