New implementation is fully functioning.

Left to do:
- add more list view delegate methods
- add support for padding and clipToPadding flag
- add xml attributes support
added a ton of delegate methods
fix smooth scrolling to a position
measure header and make use of the measured height to get instant height change feedback
added support for many xml attributes.

- Padding does not work properly
- The first header flashes once when sticking
fixed header layout issue causing it to receive double padding
remove delay of adding/removing views to fix flicker on first sticky header
fix header measure issue
fixed issue where header would not respect initial padding when clipToPadding was false
added support for android 2.3
updated readme to reflect changes
added minor support for android 2.1
Merge branch 'framelayout_base'