Add PHP 5.6 and Nightly to Travis CI
Add PHP 5.6 and Nightly to Travis CI

kateloschinina/KiRa,Schploople/ryanjp-website,tompepper/tp-foundationpress,codenamesrk/WP-Starter,colin-marshall/FoundationPress,davenaylor/FoundationPress,tompepper/tp-foundationpress,codenamesrk/WP-Starter,bellatl/FoundationPress,circleb/SustainLife,linuxbastard/FoundationPress,Schploople/ryanjp-website,randmanrjr/FoundationPress-randman,zeppytoh/cruorgsg-fp,Schploople/ryanjp-website,scordes11/rachel-site,skoldin/FoundationPress,kateloschinina/KiRa,adamfeuer/FoundationPress,ozunaj/JaredPress,randmanrjr/FoundationPress-randman,olefredrik/FoundationPress,skoldin/FoundationPress,circleb/SustainLife,philipptrenz/wkkv_theme,tvnweb/Euroma2017,philipptrenz/wkkv_theme,davenaylor/FoundationPress,scordes11/rachel-site,adamfeuer/FoundationPress,linuxbastard/FoundationPress,colin-marshall/FoundationPress,ozunaj/JaredPress,zeppytoh/cruorgsg-fp,Negative-Network/FoundationPress,tvnweb/Euroma2017,bellatl/FoundationPress,olefredrik/FoundationPress,Negative-Network/FoundationPress