Merge tag 'v1.4.2'

1.4.2

 * Add Dockerfile for Docker Hub automated build (Ryan Graham)

 * debug: don't put process.env into the commits (Sam Roberts)

 * debug: don't warn on absence of config file (Sam Roberts)

 * debug: fix debug output suggesting process leaks (Sam Roberts)

 * debug: log the info that triggered an update (Sam Roberts)
Support sl-run spawn on Windows

We were injecting all our dependencies .bin dirs into our path, and
expecting spawn would find them. On Windows, node scripts aren't
executable, so it doesn't matter if they are in the PATH. So, we
tokenize the start command, naively, but good enough for now
(configurability of the start command is going away ASAP), and spawn
node to execute the supervisor script.
Merge pull request #88 from strongloop/feature/windows-slrun-support

Support sl-run spawn on Windows
v1.5.0
Merge branch 'release/1.5.0' into production