Fix for browsers on devices which handle both mouse and touch events

[patstuart]

Tested, no issues found on the following:

jQuery version:

• MS Edge desktop
• IE 9-11 desktop
• IE 5, 7, 8 through IE11 compatibility mode
• Firefox desktop / mobile
• Chrome desktop / mobile / touchscreen hybrid
• Safari desktop / mobile
• Android browser
• Dolphin browser

Pure Javascript version:

• MS Edge desktop
• IE 11 desktop
• IE 5, 7, 8, 9, 10 desktop through IE11 compatibility mode
• Firefox desktop
• Chrome desktop / touchscreen hybrid

[wieringen]

Really nice and very clean!! Pulled, deployed and bumped version to 2.5.0.