Native sticky support @wip
Add refresh method
Ignore margin top as native sticky does, add option top, add set options support
Refactor, comment, readme, useNativeSticky option
Do feature detection during first initialization not on document ready. Update readme.
Introduce jasmine, create main functionality test
Update readme
Catch ie8 illegal argument on unsopported css value
Adapt demo layout to native sticky
Update readme for new version
Prepare version 0.3.0