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
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
testing, issue #1431: Temporarely disable TestContainerTop from the testsuite
Merge pull request #1572 from dotcloud/1431-disable-TestContainerTop

Tests: testing, issue #1431: Temporarely disable TestContainerTop from the testsuite
Merge pull request #1550 from dotcloud/update-dependencies-in-readme

Update readme with dependencies for building
Show tag used when image is missing
updated default
Merge pull request #1575 from evanphx/tags

Show tag used when image is missing