#147 Mouse wheel zoom mode acting inverted.
Another solution could be to call zoomOut with -deltaY.

Signed-off-by: François Le Rolland <francois.lerolland@gmail.com>
Merge branch 'master' of https://github.com/franlero/jQRangeSlider
#147 Adapted unit tests 

Signed-off-by: François Le Rolland <francois.lerolland@gmail.com>
Merge branch 'master' of https://github.com/franlero/jQRangeSlider
Merge pull request #148 from franlero/master

Fixes #147