Add expand collapse child for legend. Progress on update observable array when there is a sort in legend.
Change to esri javascript api 3.9
Merge pull request #9 from jolevesq/esri39

Change to esri javascript api 3.9
Enable sort on legendLayers array when author sort the legend. Solve problem in accordion css class refresh. Stop bubbling for open/close all.
Merge pull request #10 from jolevesq/wms-call

Sort legendLayers when auhtor sort legend ui.