ensure attribute value is synchronized such that rerendering the control won’t displace the correct value

Enyo-DCO-1.1-Signed-Off-By: Cole Davis (cole.davis@lge.com)
Merge pull request #591 from enyojs/fix-input

ensure attribute value is synchronized such that rerendering the control...

Reviewed-By: Ben Combee (ben.combee@lge.com)