Allow multiple views in PullToRefreshLayout.

- Fixes having empty views for AdapterView. Closes #67.
Fix typo in 5756257adf8dd8df67cc96c1982dfcb8952c94a0
Use ints for y co-ordinates.
Corrected SCM url

The human friendly URL points to the wrong repository.
Enforce Minimum SDK level when using DefaultHeaderTransformer.
Ignore *.properties files
Remove old *.properties files
Add new ActionBarCompat Extra
New sample demonstrating the ABC Extra
Small improvements to ABS Sample
Working Gradle Build!
Fix Memory Leak.

Was using an Activity as the key in a WeakHashMap (good), but the key object held a strong reference to the Activity (bad) which meant that it would never be released.

Should close #77.
Fix Memory Leak. Remove all Attacher instance tracking. Properly close #77.
Fix PullToRefreshLayout.
Move DefaultHeaderTransformers out of Attachers. Makes the Attacher classes much easier to scan.
Fix last commit. Would help if I added the new classes.
Use Action Bar's Title Style for text appearance.

Closes #53.
Add new HeaderViewListener.

Closes #83.
Merge branch 'development' of github.com:chrisbanes/ActionBar-PullToRefresh into development
Add javadoc to HeaderViewListener constants