Added default alter behavior.  Made sync.alter use it. User adapters' ALTER can override it.
Added default alter behavior.  Made sync.alter use it. User adapters' ALTER can override it.

curphey/sails,harrissoerja/sails,antoniopol06/sails,adrianha/sails,rlugojr/sails,denismars/sails,konstantinzolotarev/sails,pmq20/sails,shaunstanislaus/sails,wsaccaco/sails,jenalgit/sails,robincafolla/sails-hbs,antodoms/sails,JumpLink/sails,tempbottle/sails,dylannnn/sails,vip-git/sails,saniko/soundcloud_mithril,krishnaglick/sails,leedm777/sails,yangchuoxian/sails,cazulu/sails,ctartist621/sails,winlolo/sails,rlugojr/sails,Josebaseba/sails,saniko/soundcloud_mithril,calling/sails,alexferreira/sails,jsisaev1/sails,metidia/sails,togusafish/logikinc-_-sails,AnyPresence/sails,listepo/sails,xjpro/sails-windows-associations,taogb/sails,prssn/sails,Karnith/sails-for-gulp,mphasize/sails,justsml/sails,yinhe007/sails,hokkoo/sails,erkstruwe/sails,mauricionr/sails,hokkoo/sails,jianpingw/sails,saronwei/sails,jianpingw/sails,apowers313/sails,Hanifb/sails,marnusw/sails,artBrown/sails,hellowin/sails,EdisonSu768/sails,mnaughto/sails,leobudima/sails,Benew/sails,rkJun/sails,corbanb/sails,kevinburke/sails,dbuentello/sails,giano/sails,baracudaengine/SailsUi,janladaking/sails,zand3rs/sails,balderdashy/sails,jakutis/sails,scippio/sails,Shyp/sails,anweiss/sails,t2013anurag/sails,alex-zhang/sails,youprofit/sails,tjwebb/sails,haavardw/sails,sunnycmf/sails,giano/sails,vip-git/sails,robincafolla/sails-hbs,boarderdav/sails