fix progressbar in docker push
 Installation for FrugalWare
+ added missing link in index.rst
* some gramatic and spelling fixes

Thx jamtur :)
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`
* s/docker/Docker/
Fix typo in working with volumes doc page
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.
add a simple note to suggest to the user to use RUN curl/wget/tool if the URL they need is behind auth
Update Dockerfile to use stackbrew/ubuntu (until it graduates), update Dockerfile MAINTAINER line, coalesce all apt-get installs into one invocation (including s3cmd by bringing in backports)
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 #3380 from SvenDowideit/add-no-auth-note

add a simple note to suggest to the user to use RUN curl/wget/tool if the URL they need is behind auth
Merge pull request #3312 from DeX77/master

 Installation for FrugalWare
Merge pull request #3371 from Grunny/volumes-typo-fix

Fix typo in working with volumes doc page