Bug fix: Scrollbar now responds to touch events

In previous versions of the SwipeListView's onInterceptTouch(...) in the ACTION_DOWN case statement, there was not a call to the super class's onInterceptTouch(...) method. Not calling the super class's method prevented touch events from getting to the scrollbar when fast scroll was enabled on ListViews.
Call to action
Merge pull request #119 from AOrobator/patch-1

Bug fix: Scrollbar now responds to touch events
Gradle only build, updated docs, removed outdated demo project