Rename enyo.GridList.ImageItem -> enyo.GridListImageItem
Enyo-DCO-1.1-Signed-Off-By: Kevin Schaaf (kevin.schaaf@lge.com)
Update GridListSample.js

Rename use of enyo.GridListImageItem in sample

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #38 from enyojs/pilot-4-fixes-kevinpschaaf

Various pilot-4 fixes

Reviewed-By: Ben Combee (ben.combee@lge.com)