Update AroundList to match final List.js listTools definition

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@palm.com)
Fix missing placeholder from previous refactoring

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@palm.com)
ENYO-1809: add centerReorderContainer property to enyo.List, use it in samples/ListLanguagesSample.js

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@palm.com)