added checks for iterables support in Promise.all/Promise.race
added checks for iterables support in Promise.all/Promise.race

these methods should support iterables.
http://www.ecma-international.org/ecma-262/6.0/#sec-promise.all
http://www.ecma-international.org/ecma-262/6.0/#sec-promise.race

lukewestby/compat-table,cletusw/compat-table,williamboman/compat-table,BorisKozo/compat-table,peterchealse/compat-table,gskachkov/compat-table,mj1856/compat-table,cletusw/compat-table,Delapouite/compat-table,levi0913/compat-table,mzgol/compat-table,levi0913/compat-table,BorisKozo/compat-table,williamboman/compat-table,lukewestby/compat-table,popomore/node-es-test,natorion/compat-table,mzgol/compat-table,LuoPQ/compat-table,KTamas/compat-table,KTamas/compat-table,gratex/compat-table,gratex/compat-table,deltakosh/compat-table,popomore/node-es-test,Delapouite/compat-table,sylvain-/compat-table,peterchealse/compat-table,mj1856/compat-table,sylvain-/compat-table,gskachkov/compat-table,natorion/compat-table,deltakosh/compat-table,LuoPQ/compat-table