Sort APIImages by most recent creation date.

Fixes #985.
Fix Graph ByParent() to generate list of child images per parent image.
Add test case for Graph ByParent().
Add USER instruction
Limit commands to containers of a relevant state
Merge pull request #1538 from KSid/bash-completion-limit-containers

Bash Completion: Limit commands to containers of a relevant state
Fix #1517, #1521 by adding sudo to examples and installation.
Merge pull request #1537 from metalivedev/1517-sudodocker

Fix #1517, #1521 by adding sudo to examples and installation.
Add imagename to LogEvent tests
Merge pull request #1549 from dotcloud/fix-logevent-tests

Add imagename to LogEvent tests
Merge pull request #1495 from bdon/master

Fix Graph ByParent() to generate list of child images per parent image.
hot fix display in parallel pull and go fmt
Merge pull request #1551 from dotcloud/hotfix_parallel_pull_display

hot fix display in parallel pull and gofmt
fix can't connect message
 with socket
Update readme with dependencies for building

Closes #915
Add instructions for creating and using the docker group
remove extraneous step and stupid whitespace
registry: removing opaqueRequest
Merge pull request #1473 from shin-/978-opaque-v2

Reworking opaque requests in registry module
Merge pull request #1569 from TylerBrock/patch-1

Add instructions for creating and using the docker group