Packaging, dockerbuilder: Automate pushing docker binary packages
+ Builder: ADD of a local file will detect tar archives and unpack them
	into the container instead of copying them as a regular file.

* Builder: ADD uses tar/untar for copies instead of calling 'cp -ar'.
	This is more consistent, reduces the number of dependencies, and
	fixe #896.
Merge pull request #887 from dotcloud/761-packaging-dockerbuilder

Packaging, dockerbuilder: Automate pushing docker binary packages
Bumped version to 0.4.1
add port redirection doc
Added content to port redirect doc
Typo
Merge pull request #897 from dotcloud/fix-overlapping-add

* Builder: ADD improvements: use tar for copy + automatically unpack local archives
Merge pull request #911 from dotcloud/add_port_redirection_doc

* Documentation: add port redirection doc
Merge pull request #912 from dotcloud/bump_0.4.1

Bumped version to 0.4.1
Packaging|dockerbuilder, issue #761: use docker-golang PPA. Add Dockerfile header