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

Thx jamtur :)
* s/docker/Docker/
Fix typo in working with volumes doc page
Add DOCKER_HOST env var for client

This env var will set the -H flag on the docker
client.
add a simple note to suggest to the user to use RUN curl/wget/tool if the URL they need is behind auth
fixed header size on narrow desktop window
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)
Merge pull request #3386 from bwiklund/headerfix

Fixed header image on docs.docker.io site
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
Numerous small fixes to the CLI documentation
Merge pull request #3394 from jamtur01/clifixes

Numerous small fixes to the CLI documentation
Minor fixes to the basic command documentation
Merge pull request #3344 from tianon/dockerfile-cleanup

Many various Dockerfile cleanups
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
Fixes Issue #3400

See Issue #3400