Merge pull request #2200 from alexlarsson/dm-remove-unused

Runtime: Remove unused funtion hasFilesystemSupport()
Merge pull request #2199 from alexlarsson/dm-docs

Add some docs for newly exported functions
Ignore cleanup with /dev/mapper does not exist
Use incrementing prefix on pool and loopback to allow dind
Make sure the base device is well created before running the tests
Initialize devicemapper in NewRuntimeFromDIrectory
Rename mkimage-debian.sh to mkimage-debootstrap.sh to more clearly reflect its true function
Move contrib/docker.bash to contrib/completion/bash/docker for better organization
Add zsh completion from @felixr with permission

See https://github.com/felixr/docker-zsh-completion for the original.
See also https://github.com/dotcloud/docker/issues/2202#issuecomment-26313287

Fixes #2202
Add vim syntax highlighting for Dockerfiles from @honza

See https://github.com/honza/dockerfile.vim
See also https://twitter.com/_honza/status/390046317579620352
Refactor mkimage-debootstrap.sh to be much more full-featured

This includes the following:
- options to control certain parameters
- an option specifically for creating tarballs directly, esp. for dockerbrew
- the addition of the updates and security repositories for Debian images
- the addition of the universe, updates, and security repositories for Ubuntu images
- more correct tagging of Debian images
- tagging of Ubuntu image versions (12.04, 12.10, etc) and latest tag for LTS
Fixed broken tests

Some tests failed because the `auplink` binary was not found inside of the
"docker" container.
Rename loopback dir to devicemapper
Add filesystemtype for containers

If no type is specified then assume aufs.
Merge pull request #2227 from dotcloud/dm-rename-loopback

Rename loopback dir to devicemapper
devmapper: create device nodes 'on create' instead of 'on resume'
Merge branch 'dm-fix-test-2' into dm
Merge branch 'dm-missing-mapper' into dm
Fix #1919 document how to edit and release docs.
hack: only run certain tests with TESTFLAGS='-run TestName' make.sh