Split TouchRotateAndZoom interaction.

Split TouchRotateAndZoom interaction into two new interaction:
TouchRotate and TouchZoom.
Reset position on touch end
Add missing 'protected' comment for targetTouches prop.
Add optional kinetic parameter.
Rename ol.ViewHint.PANNING to ol.ViewHint.INTERACTING
Merge pull request #230 from fredj/touch-navigation

Touch navigation issues