Updated to Hammer.js 2.0.4

There is now another Meteor package which provides HammerJS v2.0.4, which I require for my project, but it doesn't include the jQuery wrapper.  As a result, I've updated this package to include the newer Meteor package and then enable the jQuery wrapper, so that provided [quarterto:hammer](https://github.com/quarterto/meteor-hammer.git) is maintained, this will always wrap the latest version.