add travis build matrix for all built-in PostgreSQL versions
add travis build matrix for all built-in PostgreSQL versions

mihai-stancu/dbal,cassvail/dbal,doctrine/dbal,drieschel/dbal,janschoenherr/dbal,LionwareSolutions/dbal,AlexDpy/dbal,DHager/dbal,PowerKiKi/dbal,adrienbrault/dbal,mRoca/dbal,vutung2311/dbal,mikeSimonson/dbal,LionwareSolutions/dbal,helicon-os/doctrine-dbal,lafourchette/dbal,hason/dbal,bspeterson/dbal,gencer/dbal,kupishkis/dbal,wuxu92/dbal,sarcher/dbal,mariuz/dbal,BenMorel/dbal,DHager/dbal,hason/dbal,deeky666/dbal,webonyx/dbal,stof/dbal,doctrine/dbal,BenMorel/dbal,shivergard/dbal,drieschel/dbal,tk-s/dbal,AlexDpy/dbal,mariuz/dbal,mathroc/dbal,sarcher/dbal,janschoenherr/dbal,zeroedin-bill/dbal,deeky666/dbal,shivergard/dbal,mbeccati/dbal,easybiblabs/dbal,gencer/dbal,mihai-stancu/doctrine-dbal,vortgo/dbal,sarcher/dbal,LionwareSolutions/dbal,mbeccati/dbal,kimhemsoe/dbal,stof/dbal,mihai-stancu/dbal,v-bartusevicius/dbal,kupishkis/dbal,v-bartusevicius/dbal,mihai-stancu/doctrine-dbal,tk-s/dbal,arima-ryunosuke/dbal,stchr/dbal,Tobion/dbal,webonyx/dbal,kupishkis/dbal,PowerKiKi/dbal,mariuz/dbal,lafourchette/dbal,vortgo/dbal,mRoca/dbal,cassvail/dbal,adrienbrault/dbal,mathroc/dbal,kimhemsoe/dbal,easybiblabs/dbal,mikeSimonson/dbal,webonyx/dbal,nfrignani/dbal,zeroedin-bill/dbal,arima-ryunosuke/dbal,hason/dbal,Tobion/dbal,bspeterson/dbal,helicon-os/doctrine-dbal,arima-ryunosuke/dbal,stchr/dbal,nfrignani/dbal,lcobucci/dbal,adrienbrault/dbal,wuxu92/dbal,PowerKiKi/dbal,lcobucci/dbal,easybiblabs/dbal,vutung2311/dbal