Merge branch 'proper-multi-build' into 'master'

Fix base_build() with a proper support for multi-package-building through conda-build

See merge request !160
3 jobs for master in 9 minutes and 31 seconds (queued for 7 seconds)
Status Job ID Name Coverage
  Build
passed #199281
docker
build_linux

00:07:44

passed #199282
macosx
build_macosx

00:07:38

 
  Deploy
passed #199283
docker
deploy_beta

00:01:47