FIX: Linux mint troubleshooting tip

Package is called 'cgroup-lite' not 'cgroups-lite'. Verified on Linux Mint 16.

Ref http://packages.ubuntu.com/search?keywords=cgroup-lite

Docker-DCO-1.1-Signed-off-by: Dan Williams <me@deedubs.com> (github: deedubs)
Add back the Ubuntu "Memory and Swap Accounting" section that was lost when the "Kernel" page was culled

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
lets talk about the other way to make base images

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Fix misspelling

Docker-DCO-1.1-Signed-off-by: Adrian Mouat <adrian@adrianmouat.com> (github: amouat)
docs: explain DNS warnings & how to fix them

This explains how to fix the DNS warnings on Ubuntu and why they're
shown.

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #4265 from unclejack/explain_networkmanager_and_dns_problems

docs: explain DNS warnings & how to fix them
Merge pull request #4252 from SvenDowideit/mention-scratch-image

lets talk about the other way to make base images
Merge pull request #4261 from amouat/patch-1

Fix misspelling
Merge pull request #4251 from tianon/add-back-grub-info

Add back the Ubuntu "Memory and Swap Accounting" section that was lost when the "Kernel" page was culled
Merge pull request #4233 from deedubs/patch-1

FIX: Linux mint troubleshooting tip
reinforce that docker build --rm is a good default to use

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #4273 from SvenDowideit/docker-build-rm

reinforce that docker build --rm is a good default to use