add osx to travis-ci tests
add osx to travis-ci tests

jmcatamney/gpdb,Chibin/gpdb,atris/gpdb,royc1/gpdb,jmcatamney/gpdb,lintzc/gpdb,lintzc/gpdb,royc1/gpdb,lintzc/gpdb,zaksoup/gpdb,kaknikhil/gpdb,chrishajas/gpdb,atris/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,tangp3/gpdb,jmcatamney/gpdb,CraigHarris/gpdb,lisakowen/gpdb,yuanzhao/gpdb,Chibin/gpdb,Chibin/gpdb,50wu/gpdb,greenplum-db/gpdb,royc1/gpdb,50wu/gpdb,randomtask1155/gpdb,lpetrov-pivotal/gpdb,lpetrov-pivotal/gpdb,yuanzhao/gpdb,royc1/gpdb,greenplum-db/gpdb,lpetrov-pivotal/gpdb,zaksoup/gpdb,chrishajas/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,xuegang/gpdb,adam8157/gpdb,Chibin/gpdb,ahachete/gpdb,greenplum-db/gpdb,Quikling/gpdb,lisakowen/gpdb,0x0FFF/gpdb,janebeckman/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,janebeckman/gpdb,janebeckman/gpdb,xinzweb/gpdb,yuanzhao/gpdb,yuanzhao/gpdb,50wu/gpdb,ashwinstar/gpdb,xinzweb/gpdb,janebeckman/gpdb,CraigHarris/gpdb,CraigHarris/gpdb,janebeckman/gpdb,xinzweb/gpdb,rubikloud/gpdb,foyzur/gpdb,0x0FFF/gpdb,0x0FFF/gpdb,rvs/gpdb,xuegang/gpdb,ashwinstar/gpdb,xuegang/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,rubikloud/gpdb,kaknikhil/gpdb,Quikling/gpdb,kaknikhil/gpdb,foyzur/gpdb,Quikling/gpdb,tangp3/gpdb,kaknikhil/gpdb,adam8157/gpdb,adam8157/gpdb,edespino/gpdb,janebeckman/gpdb,atris/gpdb,rubikloud/gpdb,rubikloud/gpdb,tangp3/gpdb,ahachete/gpdb,ashwinstar/gpdb,xuegang/gpdb,xinzweb/gpdb,janebeckman/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,chrishajas/gpdb,atris/gpdb,lpetrov-pivotal/gpdb,rvs/gpdb,Quikling/gpdb,cjcjameson/gpdb,chrishajas/gpdb,rvs/gpdb,randomtask1155/gpdb,Chibin/gpdb,tangp3/gpdb,cjcjameson/gpdb,foyzur/gpdb,0x0FFF/gpdb,kaknikhil/gpdb,edespino/gpdb,CraigHarris/gpdb,jmcatamney/gpdb,lintzc/gpdb,randomtask1155/gpdb,foyzur/gpdb,xuegang/gpdb,Quikling/gpdb,chrishajas/gpdb,randomtask1155/gpdb,foyzur/gpdb,xinzweb/gpdb,atris/gpdb,edespino/gpdb,janebeckman/gpdb,lisakowen/gpdb,tangp3/gpdb,adam8157/gpdb,lisakowen/gpdb,edespino/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,Chibin/gpdb,rvs/gpdb,tangp3/gpdb,atris/gpdb,yuanzhao/gpdb,lisakowen/gpdb,adam8157/gpdb,Quikling/gpdb,zaksoup/gpdb,jmcatamney/gpdb,CraigHarris/gpdb,rvs/gpdb,edespino/gpdb,adam8157/gpdb,cjcjameson/gpdb,randomtask1155/gpdb,cjcjameson/gpdb,zaksoup/gpdb,xuegang/gpdb,cjcjameson/gpdb,atris/gpdb,0x0FFF/gpdb,Quikling/gpdb,ashwinstar/gpdb,lpetrov-pivotal/gpdb,royc1/gpdb,0x0FFF/gpdb,kaknikhil/gpdb,50wu/gpdb,randomtask1155/gpdb,rvs/gpdb,CraigHarris/gpdb,rvs/gpdb,edespino/gpdb,ashwinstar/gpdb,ahachete/gpdb,foyzur/gpdb,CraigHarris/gpdb,xuegang/gpdb,xuegang/gpdb,Quikling/gpdb,royc1/gpdb,chrishajas/gpdb,lintzc/gpdb,edespino/gpdb,royc1/gpdb,ahachete/gpdb,jmcatamney/gpdb,rubikloud/gpdb,rvs/gpdb,50wu/gpdb,rubikloud/gpdb,50wu/gpdb,janebeckman/gpdb,adam8157/gpdb,Chibin/gpdb,lintzc/gpdb,kaknikhil/gpdb,Quikling/gpdb,zaksoup/gpdb,yuanzhao/gpdb,chrishajas/gpdb,janebeckman/gpdb,ashwinstar/gpdb,randomtask1155/gpdb,jmcatamney/gpdb,0x0FFF/gpdb,edespino/gpdb,zaksoup/gpdb,ahachete/gpdb,Chibin/gpdb,50wu/gpdb,xinzweb/gpdb,xinzweb/gpdb,Chibin/gpdb,ahachete/gpdb,rubikloud/gpdb,zaksoup/gpdb,0x0FFF/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,rvs/gpdb,atris/gpdb,lpetrov-pivotal/gpdb,zaksoup/gpdb,lisakowen/gpdb,CraigHarris/gpdb,lintzc/gpdb,tangp3/gpdb,ahachete/gpdb,50wu/gpdb,adam8157/gpdb,foyzur/gpdb,tangp3/gpdb,kaknikhil/gpdb,rvs/gpdb,xinzweb/gpdb,lisakowen/gpdb,xuegang/gpdb,lpetrov-pivotal/gpdb,cjcjameson/gpdb,foyzur/gpdb,Quikling/gpdb,edespino/gpdb,royc1/gpdb,CraigHarris/gpdb,ahachete/gpdb,lintzc/gpdb,lintzc/gpdb,greenplum-db/gpdb,randomtask1155/gpdb,lpetrov-pivotal/gpdb,edespino/gpdb,lisakowen/gpdb,Chibin/gpdb,rubikloud/gpdb,chrishajas/gpdb,jmcatamney/gpdb