Gesture recognition. ListView improvements.

temp. commit 2

temp commit 3

Gesture recognition. ListView's fading edges.
ViewPager arrow left and right navigation.
ViewPager timeperiods.
Slice slideback animation. ListView doesn't scroll up on slice deselect.
UI tweaks.
Sort usings.
Merge branch 'taavirehemagi-reports-navigation' into reports

Conflicts:
	Joey/UI/Views/PieChart.cs