Add workaround for Chrome pointerLock bug that caused jumpiness in mouse nav

The issue as reported to the Chromium team: https://code.google.com/p/chromium/issues/detail?id=386791&thanks=386791&ts=1403213097
Merge pull request #236 from virtual-world-framework/fix-rightclick-nav-jumpiness

Add workaround for Chrome pointerLock bug that caused jumpiness in mouse nav