Remove bsdtar by checking magic
Add unit tests for tar/untar with multiple compression + detection
Update docs
Merge branch 'master' into remove_bsdtar

Conflicts:
	docs/sources/contributing/devenvironment.rst
fix missing command in irc bouncer example
Move the attach prevention from server to client
Remove Run race condition
fix docker version git output
Fix bug on compression detection when chunck < 10bytes
* API: Add tag lookup to history command. Fixes #882
Update documentation
Packaging, issue 919: Bump version to 0.4.2
Fixed on documentation.

* replaced previously removed concepts/containers and concepts/introcution by a redirect
* moved orphan index/varable to workingwiththerepository
* added favicon to the layout.html
* added redirect_home which is a http refresh redirect. It works like a 301 for google
* fixed an issue in the layout that would make it break when on small screens
Merge pull request #920 from dotcloud/919-packaging

Packaging, issue 919: Bump version to 0.4.2
Merge pull request #914 from ToothlessGear/fix-version-output

* Client: Fix docker version's git commit output
Merge pull request #921 from dhrp/docs-redirects-and-fixes

Fixes on documentation. LGTM
Merge branch 'master' into race_attach-fix
Remove useless goroutine
Remove bsdtar dependency in various install scripts
* API: Send all tags on History API call