Improve network performance for VirtualBox

Without those lines, VitrualBox machines are being very slow with all network operations (tested only in OS X Lion, but they are supposed to work everywhere). See https://github.com/mitchellh/vagrant/issues/1807
Split stdout stderr for non-tty commands
Add stderr unit test
Make StdCopy works with huge amount of data
Add documentation
abord build if mergeConfig returns an error and fix duplicate error message
Add proper bash completion for "docker push"
Hack: remove deprecated files
hack/MAINTAINERS.md: a maintainer's manual.
Hack: update release checklist and reference it in REAMDE
Update maintainer's manual: every change should be done in a pull request.
Hack: update README
Fix #1969 formatting, add information about multiline json
Add @tianon to hack/MAINTAINERS
Merge pull request #1975 from tianon/patch-1

Add @tianon to hack/MAINTAINERS
Merge pull request #1973 from metalivedev/1969-formatfix

Fix #1969 formatting, add information about multiline json
Hack: correct typo in release checklist
Minor spelling correction of protocoll -> protocol
Add a few tweaks and fixes to contrib/mkimage-debian.sh

Add simple workaround for #1755 to contrib/mkimage-debian.sh

Add simple echo patch in contrib/mkimage-debian.sh to prevent init scripts from running during apt-get installs/updates

Add `apt-get clean` to mkimage-debian.sh for slightly smaller images

Add more small apt tweaks to mkimage-debian.sh thanks to @jpetazzo and @spahl
Merge pull request #1883 from tianon/mkimage-debian

Several small tweaks/fixes for contrib/mkimage-debian.sh