Bump to v0.5.1

*Builder: Allow the commit of a non-started container

*Client: add ps args to docker top

Fixed a couple of minor syntax errors.

Updated the description of run -d

Merge branch 'cleanup_signal_handling' of https://github.com/calavera/docker into calavera-cleanup_signal_handling

Fix wrong untag using id rmi

Upstart improvements

Bind daemon to 0.0.0.0 in Vagrant

The goal is to make it more clear this will give you the container id after run completes.

Since stdout is now standard on run, "docker run -d" is the best (or only) way to get the container ID returned from docker after a plain run, but the description (help) does not hint any such thing.

+ Builder: CmdAdd and CmdEnv now respect Dockerfile-set ENV variables

Do not show empty parenthesis if the default configuration is missing.

Add required go version for compilation

Update AUTHORS

- Builder: Create directories with 755 instead of 700 within ADD instruction

Make sure the cookie is used in all registry queries

Change reserve-compatibility to reverse-compatibility

Removed website and updated headings.

- Runtime: Fixes #505 - Make sure all output is send on the network before closing

use 0755 instead of 0700

Fixes #1286 improve-import-txz-description