Refactor loading frames for GIFs and add tests.
RemoteViewsTarget feature requested on #242

Ability to load a bitmap into an ImageView of a Widget using
RemoteViews.

Example of usage on the following gist
https://gist.github.com/pavlospt/00242d5102ac8f76e169
Add tests for AppWidget and NotificationTargets
Merge branch 'remoteviews'
Add ide files for Intellij 14
Use Interface instead of abstract ListPreloader
In your examples the ListAdapter and the final ListPreloader are
strongly connected. Using an Interface will remove this strong
connection.

Using an interface that an Adapter can implement has the following
advantages:
1. the dimensions don´t must be passed to the ListPreloader while the Adapter has the first access to the dimensions of the ImageView
2. you don´t have to pass the items to the ListPreloader, while the
Adapter already has the newest set of items (e.g.: CursorAdapter)
3. in most cases the ListAdapter already has an RequestBuilder, so
you don´t have to pass them twice
4. you get rid of an extra class (ListPrelaoder) you have to implement
Split interface to provide the size seperatly. Change interface on `PreloadModelProvider` so preload items will requested one by one.
 - introduce new interface `PreloadSizeProvider`
 - change `PreloadModelProvider` preload items will requested one by one.
 - adapt Tests
 - adapt Samples
 - add two sample implementation for `PreloadSizeProvider`
      - `FixPreloadSizeProvider` to provide a size with a fixed width and height
      - `ViewPreloadSizeProvider` provide a size request from a given view using a `OnPreDrawListener`
Use old List of models approach to preload and add some missing documentation
Cleanup comments and maintain backwards compatability for preloader.
Only set size once in ViewPreloadSizeProvider.
Update readme.
Support different target-sizes for list items
Change and remove some leftovers from testing and autoformating
Use identity matrix to detect changes in rotate.

Fixes #270.
rename preloadItem(List<T> items, int position, boolean isIncreasing) to preloadAdapterPosition(List<T> items, int position, boolean isIncreasing)
Merge pull request #273 from DavidWiesner/feature-ListPreloader-support-multiple-sizes

Feature list preloader support multiple target sizes
Fix holding onto reference to view in list.
remove imls