Remove unnecessary e.preventDefault() statements

"return false" is the equivalent to e.preventDefault() and e.stopPropagation(), so there isn't a need to have "return false" and e.preventDefault() in the same function. I removed 2 cases of this from the plugin.

Here is a good article talking about the differences and when to use "return false", e.preventDefault(), e.stopPropagation(), and e.stopImmediatePropagation() 

http://fuelyourcoding.com/jquery-events-stop-misusing-return-false/