Remove extra semicolon

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Add enyo.Object.bindSafely() to bind methods to enyo.Object instances where if the object's destroyed, the binding will do nothing.

Update Enyo internal & sample code to use bindSafely (to prove it works well and reap the benefits)

Update GestureSample to remove old property setting code that doesn't work in 2.3.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #253 from enyojs/bindSafely

add enyo.Object.bindSafely and core core to use it in preference to enyo.bind