ENYO-671: Return the getAbsoluteBounds object as a fresh mutable object.
Previously it was returning an immutable object reference which, when other code tried to modify, wouldn't get modified. Now it can be.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>
Merge pull request #963 from enyojs/ENYO-671-blakestephens

ENYO-671: Return the getAbsoluteBounds object as a fresh mutable object.

Reviewed-By: Derek Anderson (derek.anderson@lge.com)
Integrated-By: Aaron Tam (aaron.tam@lge.com)