New way to deal with selected item backgrounds, based on the Clickable interface
Updated method names that used 'select', no they use 'check'
Added gallery sample and CheckableImageView
Added CheckableFrameLayout
Adapted README to v2
New pics for README and Google Play
Remove state persistency, we let the adapter take care of this
Restructured samples for v2
Small changes in README
Update version to 9/2.0.0
Updated CHANGELOG to reflect changes in v2
Fixed typo