fix progressbar in docker push
Remove old debug from tarsum
Make sure the cache lookup returns always the same result
Log files name along with their checksum in TarSum + add a Method to retrieve the checksum map
Change BuildFile in order to use TarSum instead of custom checksum
Hash the sums for directory (ureadable when there is too many
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.
Minor fixes to the basic command documentation
Merge pull request #3395 from jamtur01/basicsfixes

Minor fixes to the basic command documentation
Merge pull request #3303 from crosbymichael/add-host-flag

Add DOCKER_HOST env var for client
Update for Ubuntu 13.10

With two additional commands, this procedure will work for Ubuntu 13.10 using the image stackbrew/ubuntu:13.10.

1) change /etc/pam.d/sshd, pam_loginuid line 'required' to 'optional'
2) echo LANG=\"en_US.UTF-8\" > /etc/default/locale
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`