Browser is deprecated and this specs were just for IE. By replacing with
`Date.UTC()` it prevents this spec is ran on Chrome where `Date.UTC() ==
NaN` and therefore would throw `Invalid date` from `new
Date(Date.UTC())`
Merge pull request #1248 from SergioCrisostomo/spec-fix-DateUTC-IE

Use Date.UTC() instead of Browser.ie
Made it so that dropevent fires after clone is destroyed. but still fires when there is no effect
fixes #1116

- Fixed small bug in Jakobs nice fix
- added first automated interactive spec! (http://jsfiddle.net/Px7sq/)
Merge remote-tracking branch 'origin/fix-1116' into more-test-newSpecs