Add beam-core, beam-migrate, beam-postgres, and beam-sqlite
Add beam-core, beam-migrate, beam-postgres, and beam-sqlite

ethercrow/stackage,spencerjanssen/stackage,simonmichael/stackage,mrkkrp/stackage,asr/stackage,fpco/stackage,Daniel-Diaz/stackage,lwm/stackage,Shimuuar/stackage,iand675/stackage,soenkehahn/stackage,athanclark/stackage,int-index/stackage,jonschoning/stackage,clinty/stackage,mgajda/stackage,creichert/stackage,massysett/stackage,fimad/stackage,wereHamster/stackage,stackbuilders/stackage,mstksg/stackage,peti/stackage,michalkonecny/stackage