Added in async operations
Opens, closes, toggles
Better stuffs
Fixed some operation stuffs
integrated with demo table with 3 sections

One adjustment was needed to make the `slideUpLastOpenedSection` method
work. The demo also uses autolayout and loads the section header view.
added another test scenario and some styling to section header
fix for sliding up
Merge branch 'slideup-fix' into master-merge
Merge branch 'master-merge'