boot2docker 1.4.0

[wkruse]

No description provided.

[MikeMcQuaid]

Let's hold of merging this until @drewwells confirms if the bug was patched.

[drewwells]

There's a sha1 mismatch, also 1.4.1 is now out.

Expected: 67313ebf6f2cd0653d7f017ae783e92da1c9e44f
Actual: de87b1c815eb54c890ecfe22530db3c2ef9972df

This doesn't appear to control the ISO which is what controls the version of docker server. boot2docker download is dangerous because it will download the latest version of the ISO. 1.4.1 address this problem boot2docker/boot2docker-cli#242. Since homebrew doesn't update the ISO, it's safe to update boot2docker-cli to 1.4.1.

Verified this is working with docker 1.3.3 client and docker 1.3.3 server.