fix progressbar in docker push
Exit with code 1 in case of error for `docker build`
Replace FPM --vendor with --license, and give it the proper value of "Apache-2.0"

Fixes #3372
Add DOCKER_HOST env var for client

This env var will set the -H flag on the docker
client.
Reorganize the syntax highlighting files in contrib under a common directory to match "contrib/init" and "contrib/completion"

This is split off from #2970.
Fix install failure when busybox can't be downloaded

Whether or not the "busybox" image downloads and runs properly at the end of the build, we don't want to have the script return a failing exit code, especially since at that point, Docker is successfully installed, and we're just tooting our own horn for good measure.
Merge pull request #3303 from crosbymichael/add-host-flag

Add DOCKER_HOST env var for client
Fixes Issue #3400

See Issue #3400
Merge pull request #3401 from odonnellryan/patch-1

Swap "grep -q" with "grep > /dev/null" so that "go help" doesn't balk when the pipe closes unexpectedly (since "grep -q" closes the pipe the second it finds a match)
Merge pull request #3392 from tianon/fix-install-failure

Fix install failure when busybox can't be downloaded
Merge pull request #3379 from tianon/organize-contrib-syntax

Reorganize the syntax highlighting files in contrib under a common directory
Merge pull request #3355 from creack/fix_build_exit

Exit with code 1 in case of error for `docker build`
support for container names in bash completion
Merge pull request #3398 from thomasleveil/bash_completion_names

support for container names in bash completion
Mac OSX command for pip was incorrect
Merge pull request #3374 from tianon/fpm-license-vendor

Replace FPM --vendor with --license, and give it the proper value of "Apache-2.0"
Merge pull request #3419 from newzealandpaul/master

Mac OS X command in docs for pip fixed
Add stubbed and commented "/etc/default/docker" to our deb package

This is to especially fix FPM 1.0+ complaining that we told it we have an /etc/default/docker "config file", but didn't actually include one.
Merge pull request #3427 from tianon/stub-deb-init-config

Add stubbed and commented "/etc/default/docker" to our deb package
Merge pull request #3287 from vieux/fix_progressbar_display_push

fix progressbar in docker push