Adding archlinux packaging documentation
Updating the arch linux installation docs

New AUR package name
Adding systemd service unit info
Check kernel version and display warning if too low
Add capabilities check to allow docker to run on kernel that does not have all options
Remove the NO_MEMORY_LIMIT constant
Improve the docker version output
Add unit tests for CompareKernelVersion
Use mount to determine the cgroup mountpoint
Cleaned up install instructions in the README

	* Addded quick install on ubuntu as the 1st install option
	* Grouped other binary installs under "binary installs"
	* Removed duplicate binary ubuntu installs (linked to the docs)
	* Improved "build from source" instructions
Removed duplicate ubuntu binary install instructions from README
Link to public images list in the README
Formatting fix in ubuntu install doc
Fix Ubuntu install doc
Moved 'under the hood' below install instructions and examples in README
Bumped version to 0.1.7
Merge pull request #422 from shawnsi/arch-docs

Arch docs
Merge remote-tracking branch 'origin/check_kernel_capabilities'
Merge branch 'master' of ssh://github.com/dotcloud/docker
Better title in ubuntu install doc
'docker push' buffers filesystem archives on disk instead of memory.