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
abord build if mergeConfig returns an error and fix duplicate error message
Add proper bash completion for "docker push"
Merge pull request #2034 from metalivedev/1969-cherrypick-fixcommitformat

Fix #1969 formatting, add information about multiline json
Add test
add missing error check
added initial draft of the Docker infrastructure doc
Fix contrib/mkimage-debian.sh apt caching prevention
Insert popularity and boost docs results.
use empty string so TempDir uses the OS's temp dir automatically (Closes #2117)
Use correct auth config when logging in.
fix rm -v
Fix some error cases where a HTTP body might not be closed

Refs #2126
Swap contrib MAINTAINERS
Make sure to close the network allocators
Add devenvironment link to CONTRIBUTING.md
Fix #2115 Clean AUFS references. Also fixes some links to client libraries and mongo example.
Merge pull request #2134 from tianon/contributing

Add devenvironment link to CONTRIBUTING.md
Merge pull request #2130 from tianon/swap-contrib-maintainers

Swap contrib MAINTAINERS
Update AUTHORS