Update HTTP Proxy Section

Docker.service file location was missing the /usr dir.
Merge pull request #7097 from LK4D4/fix_eof_dockerignore_#7093

Skip whole dir dockerignoring with warning
Merge pull request #7209 from LK4D4/test_build_from_git

Test on building from GIT url
Merge pull request #7140 from proppy/more-addtar-tests

integration-cli: add more tests for BuildAddTar
progress bar: don't strings.Repeat a negative number

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
Merge pull request #7257 from seblu/master

Improve systemd units
Merge pull request #6520 from unclejack/bump_go_to_1.3

bump Go to 1.3
Merge pull request #6943 from tiborvass/parallel_compile_test

Parallel compile test binaries
Update nodejs_web_app.md

The image centos:centos6.4 doesn't exist. Instead you have to choose between the official centos6 or centos7. Both images does not work together with de yum npm install. When choosing an centos6.5 from another distributor (tutum) it works.
jsonmessage: added test and cleaned up others

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
Merge pull request #7210 from fcarriedo/refactor-common-code

pkg/units: Refactor common code
Merge pull request #7274 from vbatts/vbatts-gh7136

progress bar: don't strings.Repeat a negative number
Correct Typo In Documentation
Merge pull request #7062 from crosbymichael/fix-lxc-caps

Fix cap drop issues with lxc
Standardize "apt-get install" usage across the repo

I might have missed some, but I think this is most of the offenders.

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
fix docker integration-cli restart test race

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Merge pull request #7280 from knappe/patch-1

Correct Typo In Documentation
integcli: add some more docker utils

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
integcli: use dockerCmdInDir in build tests

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
move resumablerequestreader to pkg

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)