Don't try to find and instance our controller if this.controller is undefined.

Enyo-DCO-1.1-Signed-Off-By: Gray Norton <gray.norton@lge.com>
Add enyo.job.throttle and enyo.Component.throttleJob, along with tests in core for job methods

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #281 from enyojs/graynorton-controller-find-and-instance-bug

Don't try to find and instance our controller if this.controller is unde...

Reviewed-By: Ben Combee (ben.combee@lge.com)
Merge pull request #282 from enyojs/throttle

Add enyo.job.throttle and enyo.Component.throttleJob, along with tests i...