Tweak resizehandle

The resizehandle always seemed a little out-of-place. These changes should make the resizehandle invisible, but still have the same effect. Only difference is that the handle area is from the border to 4px above (which is invisible), but it should be obvious enough (because the cursor changes)
Merge pull request #103 from barryvdh/patch-4

Tweak resizehandle