Properly install ppa, avoid GPG key warning
Added links to @jpetazzo 's kernel article, removed quote indents from puppet.rst
Fix attach API docs.
Merge pull request #729 from mmcgrana/fix-attach-api-docs

- Documentation: Fix attach API docs typo.
invert status created
rename containers/ps to containers/json
return 404 on no such containers in /attach
Use Ubuntu's built-in method to add a PPA repository, which correctly handles keys for you.
Add sudo to commands.
Merge pull request #709 from dhrp/links-to-kernel-doc

Added links to @jpetazzo 's kernel article, cleaned puppet doc layout
Merge pull request #733 from meejah/master

Documentation: Use add-apt-repository instead of editing sources.list
Removed deprecated SPECS directory
Merge pull request #702 from kim0/patch-2

Properly install ppa, avoid GPG key warning. Also closes #715
De-duplicated contribution instructions. The authoritative instructions are in CONTRIBUTING.md at the root of the repo.
Merge branch 'master' of ssh://github.com/dotcloud/docker
Merge pull request #732 from dotcloud/718-return_no_such_container_as_404-fix

- API: return 404 on no such containers in /attach
Merge pull request #731 from dotcloud/change_containersPs_containersJson_api-feature

* API: rename containers/ps to containers/json
Merge pull request #730 from dotcloud/invert_status_created-fix

- Runtime: invert status created in docker ps