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
Fix contrib/mkimage-debian.sh apt caching prevention
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 #2115 Clean AUFS references. Also fixes some links to client libraries and mongo example.
Update AUTHORS
document what `vagrant up` is actually doing

* don't mention outdated PPA that Vagrantfile doesn't use
* point to official Ubuntu installation instructions that Vagrant appears to be following; should be future proof
Merge pull request #2119 from SvenDowideit/2117-hardcoded-tmp-dir

use empty string so TempDir uses the OS's temp dir automatically (Closes...
Merge pull request #2125 from dotcloud/2099_rm-v_fix

- Runtime: fix `docker rm` with volumes
Merge pull request #2139 from metalivedev/2115-AUFScleanup

Fix #2115 Clean AUFS references.
Merge pull request #2144 from shamrin/patch-5

document what `vagrant up` is actually doing
Corrected error in the package name
Remove deprecated packaging directory (distro-specific packaging is now managed downstream by their respective package maintainers)
Small fixes to parameter names in docs for ADD command.
Minor updates to postgresql_service.rst

I've added the steps that were missing/wrong for me when I went through this just now.
Merge pull request #2155 from jdubois/patch-1

- Documentation: Corrected error in the package name
Record termination time in state.

Supercedes pull #1946
Clarify LGTM process to contributors.
tell the new developer how they can replace the real docker binary with the one they've been hacking on (#2142)