revert _searchPossibleTargets closer to main implementation, still leaving active object shortcut(bug) commented out

commented out the section where it tries to shortcut on the active
object.

This change makes it so that if you select an object, you can NEVER
select an object on top of it.
Commenting out this section for now.

searchPossibleTargets regression #1188
https://github.com/kangax/fabric.js/issues/1188
older, working: http://jsfiddle.net/fotoguy42/96JNh/1/
newer, busted: http://jsfiddle.net/fotoguy42/R5dpN/1/