Add an utility class to aggregate some common functions.
Add superclass for example Activities to aggregate duplicate codes.
Aggregate dummy data creation codes.
Add superclass for FillGapActivities to aggregate duplicate codes.
Fix ViewPager's edge effect is incorrect in ViewPagerTab example. #35
Add example of controlling ActionBar from Fragment.
Merge branch 'master' of https://github.com/ksoichiro/Android-ObservableScrollView

Signed-off-by: Andrea Cappelli <a.cappelli87@gmail.com>

Conflicts:
	observablescrollview-samples/src/main/java/com/github/ksoichiro/android/observablescrollview/samples/SlidingUpBaseActivity.java