Unified mouse and mobile touch input events

Use this plugin to handle both keyboard-mouse and mobile touch motions with a unified set of events. It is currently being used in a commercial SPA and is featured in the book [Single page web applications - JavaScript end-to-end](http://manning.com/mikowski). Supported motions for both desktop and touch devices include tap, long-press, drag, long-press-drag, and zoom. See the README.md on the home page for much greater detail. Please see 'ue-test.html' file for a demonstration of the different motions. Most test tiles below the second row are negative test cases and should not be draggable (the one exception is the 'held+helddrag' example).