Override shouldCollapse in ArrayField.js
Override shouldCollapse in ArrayField.js

This lets `collapse: true` do the right thing for any *Array fields.
Using the default `shouldCollapse` implementation in Field.js doesn't
work when the value is an array.

Fixes #1111

woody0907/keystone,danielmahon/keystone,wmertens/keystone,Adam14Four/keystone,pswoodworth/keystone,danielmahon/keystone,pswoodworth/keystone,dvdcastro/keystone,qwales1/keystone,benkroeger/keystone,beni55/keystone,vokal/keystone,tomasztunik/keystone,Ftonso/keystone,antonj/keystone,mikaoelitiana/keystone,xyzteam2016/keystone,andrewlinfoot/keystone,stosorio/keystone,Freakland/keystone,kristianmandrup/keystone,beni55/keystone,mbayfield/keystone,Pop-Code/keystone,Pop-Code/keystone,lojack/keystone,wilsonfletcher/keystone,danielmahon/keystone,DenisNeustroev/keystone,douglasf/keystone,webteckie/keystone,trystant/keystone,SlashmanX/keystone,everisARQ/keystone,Tangcuyu/keystone,antonj/keystone,Ftonso/keystone,benkroeger/keystone,gcortese/keystone,kidaa/keystone,vokal/keystone,everisARQ/keystone,Redmart/keystone,kidaa/keystone,sarriaroman/keystone,frontyard/keystone,mikaoelitiana/keystone,Pylipala/keystone,andrewlinfoot/keystone,andreufirefly/keystone,mekanics/keystone,jacargentina/keystone,trentmillar/keystone,tanbo800/keystone,KZackery/keystone,matthieugayon/keystone,matthewstyers/keystone,udp/keystone,naustudio/keystone,ligson/keystone,KZackery/keystone,tony2cssc/keystone,andrewlinfoot/keystone,rafmsou/keystone,SJApps/keystone,davidbanham/keystone,joerter/keystone,akoesnan/keystone,stosorio/keystone,lastjune/keystone,rafmsou/keystone,Pylipala/keystone,unsworn/keystone,xyzteam2016/keystone,concoursbyappointment/keystoneRedux,BlakeRxxk/keystone,wilsonfletcher/keystone,tony2cssc/keystone,creynders/keystone,riyadhalnur/keystone,alobodig/keystone,udp/keystone,gemscng/keystone,ratecity/keystone,alobodig/keystone,vokal/keystone,kumo/keystone,youprofit/keystone,ratecity/keystone,trentmillar/keystone,the1sky/keystone,qwales1/keystone,snowkeeper/keystone,davibe/keystone,developer-prosenjit/keystone,onenorth/keystone,omnibrain/keystone,vmkcom/keystone,lojack/keystone,chrisgornall/d29blog,jstockwin/keystone,the1sky/keystone,codevlabs/keystone,kwangkim/keystone,joerter/keystone,davidbanham/keystone,codevlabs/keystone,pr1ntr/keystone,unsworn/keystone,Yaska/keystone,magalhas/keystone,onenorth/keystone,dryna/keystone-twoje-urodziny,youprofit/keystone,gemscng/keystone,linhanyang/keystone,wmertens/keystone,belafontestudio/keystone,magalhas/keystone,jrit/keystone,MORE-HEALTH/keystone,douglasf/keystone,akoesnan/keystone,creynders/keystone,benkroeger/keystone,dryna/keystone-twoje-urodziny,lastjune/keystone,Tangcuyu/keystone,WofloW/keystone,brianjd/keystone,concoursbyappointment/keystoneRedux,jeffreypriebe/keystone,matthieugayon/keystone,nickhsine/keystone,mbayfield/keystone,tanbo800/keystone,michaelerobertsjr/keystone,kumo/keystone,wustxing/keystone,Yaska/keystone,trystant/keystone,SlashmanX/keystone,geminiyellow/keystone,sarriaroman/keystone,kwangkim/keystone,pr1ntr/keystone,asifiqbal84/keystone,developer-prosenjit/keystone,kloudsio/keystone,matthewstyers/keystone,naustudio/keystone,chrisgornall/d29blog,jacargentina/keystone,ligson/keystone,w01fgang/keystone,asifiqbal84/keystone,w01fgang/keystone,ONode/keystone,geminiyellow/keystone,snowkeeper/keystone,SJApps/keystone,jeffreypriebe/keystone,tomasztunik/keystone,jstockwin/keystone,stunjiturner/keystone,Freakland/keystone,michaelerobertsjr/keystone,andreufirefly/keystone,sendyhalim/keystone,suryagh/keystone,omnibrain/keystone,woody0907/keystone,vmkcom/keystone,WingedToaster/keystone,frontyard/keystone,francesconero/keystone,BlakeRxxk/keystone,Adam14Four/keystone,MORE-HEALTH/keystone,cermati/keystone,mekanics/keystone,webteckie/keystone,dvdcastro/keystone,matthewstyers/keystone,Yaska/keystone,belafontestudio/keystone,gcortese/keystone,Redmart/keystone,kloudsio/keystone,riyadhalnur/keystone,kristianmandrup/keystone,cermati/keystone,francesconero/keystone,efernandesng/keystone,efernandesng/keystone,frontyard/keystone,sendyhalim/keystone,jrit/keystone,nickhsine/keystone,suryagh/keystone,stunjiturner/keystone,DenisNeustroev/keystone,wustxing/keystone,ONode/keystone,WofloW/keystone,davibe/keystone,brianjd/keystone,trentmillar/keystone,naustudio/keystone,WingedToaster/keystone