Tweaks to the ci plugin after trying CircleCI
Tweaks to the ci plugin after trying CircleCI

For best results use 'make -k ci'. 'make ci-prepare' can be
used to setup the OTP installations needed.

ingwinlu/erlang.mk,bsmr-erlang/erlang.mk,nevar/erlang.mk,hairyhum/erlang.mk,ninenines/erlang.mk,rabbitmq/erlang.mk,a12n/erlang.mk,yannayl/erlang.mk,crownedgrouse/erlang.mk,KrzysiekJ/erlang.mk,jj1bdx/erlang.mk