Remove enyo.GridList and supporting kinds

Due to the better implemented enyo.DataGridList that's
part of the core Enyo library starting in 2.3.0, we've
removed enyo.GridList and it's associated samples.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #79 from enyojs/remove-gridlist

Remove enyo.GridList and supporting kinds