leap: first implementation of LeapFinger, inspired from LeapMotion by thomas
Reimplement StencilView in ScrollView nativly.
Add option to show scroll bars permenently.
Add option to scroll proportional and in same direction as drag.
Remove unused old function.
Add option to enable scrolling from on top of the scroll bars only.
Add example when scrollview is run.
Finish implementing propotionate scrolling.
Imporve example.
Always allow mouse wheel scrolling.
Merge branch 'refs/heads/input-leapfinger'
fixes for latest leap sdk version

specifically version 1.08
fixed error when closing application

By adding a listener for exit and doing absolutely nothing in it. But it works
pos3d profile and z position
normalized z for leap
Merge branch 'master' of https://github.com/kivy/kivy
Changed pep8 checker and hook to env python2

Previously used just 'python', which fails on systems where this
defaults to python3 (i.e. Arch Linux).
Changed env python to env python2
Added App.get_settings_widget to let user override
Added settings display method

Can be overridden to display settings panel in different ways.