To prevent undesirable release of analogue joystick while using touchpad.

While playing FPS game like Goldeneye, The World is not Enough etc with touchpad, the cursor/crosshair/crosswire tries to return to origin/centre thus preventing player to set it to target hence shoot it. Now this can be prevented by pressing Left Window Key, then moving cursor through touchpad.
Merge pull request #6 from s-verma/master

To prevent undesirable return to centre of cursor while using touchpad.
fix comment and add special modifier key notes in README
Merge branch 'master' into travisci