pkg/tarsum: avoid buf2 allocation in Read

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
update the cli / man page docs based on what is in master right now

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Remove internet dependency from TestBuildCacheADD

Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com>
Add GoDoc and Travis build link/images to README

Signed-off-by: Vojtech Vitek (V-Teq) <vvitek@redhat.com>
Fix search test for busybox image

Signed-off-by: Michael Crosby <michael@docker.com>
Merge pull request #7628 from crosbymichael/fix-search-test

Fix search test for busybox image
Merge pull request #7604 from SvenDowideit/docs-update

update the cli / man page docs based on what is in master right now
Merge pull request #7613 from VojtechVitek/godoc_travis

Add GoDoc and Travis build link/images to README
Merge pull request #7602 from unclejack/tarsum_garbage_reduction

pkg/tarsum: avoid buf2 allocation in Read
Merge pull request #7608 from LK4D4/remove_internet_dep

Remove internet dependency from TestBuildCacheADD
Added warning re: using root for dockerfile root. Fixes #7612

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
Use HTTPS for newsletter signup form

This is causing an insecure HTTPS error in Chrome 37.

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Fixed a typo and added a bit based on Sven's feedback

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
Cleanup: correct cli --volumes-from description

issue #7580 volumes-from comma separated list mentioned this case.

Options like --volumes-from=[] indicate they can be specified multiple times:
docker run -it --rm --volumes-from TEST_DATA --volumes-from TEST_DATA2 ubuntu bash

Signed-off-by: Deshi Xiao <dxiao@redhat.com>
Merge pull request #7640 from xiaods/develop

Cleanup: correct cli --volumes-from description
Merge pull request #7635 from bfirsh/docs-https-newsletter-url

Use HTTPS for newsletter signup form
Merge pull request #7633 from fredlf/root_builder_warning

Added warning re: using root for dockerfile root. Fixes #7612