Update AMD define call so that it works with Mousetrap 1.5
Update AMD define call so that it works with Mousetrap 1.5

Fixes #255
Closes #156

Mousetrap is now a constructor function vs. a global object so I
**think** this is the way to make it work.  If anyone with more
knowledge about AMD could confirm that would be great

mousetrap-js/mousetrap,ccampbell/mousetrap,ccampbell/mousetrap,mousetrap-js/mousetrap