Fix memory leak by removing clone when scope is destroyed.

[dlongley]

This PR fixes a memory leak that occurred because the cloned element(s) weren't removed and cleaned up when the directive scope was destroyed. It also adds a missing semi-colon and removes some trailing whitespace.

[zachsnow]

Thanks very much!

[dlongley]

Thank you for a cool lib! Could you bump the bower version and tag a new release with this fix?

[zachsnow]

Yeah of course, sorry for the delay.

[dlongley]

Thanks!