Configurable 2 fingers pinch gesture #30
                
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Added pinch gestures
Basic implementation enables one shot pinch gesture.
That is the command from config file will run only once as soon as
fingers move 50% from the initial fingers position.
Added a configurable distance variable to pinch gesture.
I felt that pinch gesture is kinda tricky to execute on touchpad,
so I changed a way of calculation when to trigger the command and
added the distance for fingers travel to configuration.
Basically a
0.5distance feels quite ok to me, but it becomes reallysnappy at
0.1.