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Add udev rules files for hiding the docker loopback devices from udisks

This prevents them from showing up on the desktop in a window manager, for example.
Remove mkimage-centos.sh in favor of a new rinse-based script, since febootstrap is fragile and picky
Update bundlescript shebangs to be bash, reflecting how they're actually invoked
Add cgroup-bin dependency to our Ubuntu package

Since cgroup-bin is only "recommended" by the lxc package on Ubuntu, but is necessary for having the proper cgroups mounted for Docker to function, this makes some sense for us to add separately.

Fixes #2990
add an example of docker ps, and also of link aliases
Instructions on how to install Docker on Red Hat Enterprise Linux / CentOS.
Add a proposal step for potential MAINTAINERS.

Fixes #3014
Added note about Ubuntu curl installation
- Updated the doc with the current implementation status
initial stab at writing a use/ambassador-pattern howto (Issue #2485)
Move test cpu shares out of test start

Fixes #2107
sd_notify ready status when accepting API requests
Add Sven Dowideit to docs maintainers
I was reading the doc, and noticed that some examples didnt use $ sudo docker, so this makes it a little more consistent
add a little prose to tell the user that run creates a container, and then starts it
- Added link to the source code repo on github
use the Makefile in the dev environment documentation - its way less typing, and fewer typing mistakes
docs/installation/google: add enabling Google Compute Engine step
add docs for the new json format