Merge branch 'release/0.4.0' into develop

* release/0.4.0:
  Bump Homebrew version for 0.4.0
Use embedded libcork

We don't need to look for an installed copy of libcork; we've got our
own embedded copy to cut down on runtime dependencies.
Bump Homebrew version for 0.4.1
Merge branch 'release/0.4.1'

* release/0.4.1:
  Bump Homebrew version for 0.4.1
  Use embedded libcork