#174 Check if the image is already in the garbage before moving it. If it does, remove (really) the older one.
Add unit test for #174 Delete image already deleted then repulled
Merge remote-tracking branch 'origin/docs'
Merge remote-tracking branch 'origin/174-remove_image_twice-fix'
fixed some of the syntax in example

The example was broken, I updated it to work with latest version of code.
Merge branch 'master' of ssh://github.com/dotcloud/docker
Merge remote-tracking branch 'dotcloud/master' into dhrp/docs
Merge remote-tracking branch 'dotcloud/master' into dhrp/docs

Conflicts:
	docs/sources/examples/python_web_app.rst