add basic support for unix sockets
add the possibility to use multiple -H
add tests
update docs
Merge branch 'master' into add_unix_socket-feature
gofmt and test sub directories in makefile
add testall rule
batch apt-get install operations for speed

The dockerbuilder Dockerfile was installing one package per apt-get
install operation.

This changes it so that consecutive run apt-get install operations are
batched into a single operation.
update docs
Merge pull request #938 from dotcloud/add_unix_socket-feature

* Runtime: Add unix socket and multiple -H
Merge pull request #941 from dotcloud/makefile_test_subpackages

gofmt and test sub directories in makefile
Merge pull request #946 from unclejack/speed_up_dockerbuilder_image_creation

dockerbuilder : batch apt-get install operations for speed