Add collectd plugin for reporting docker lvm usage stats
Touch up docker lvm collectd plugin based on manual testing
Update SDK Tools to v.24.0.1 and Build Tools to v.21.1.2

Update SDK Tools version to 24.0.1
Update SDK Tools checksum (sha256sum)
Update SDK Build Tools version to 21.1.2

Google released a new version of SDK tools, further information here:
https://developer.android.com/sdk/index.html#Other

Download:
http://dl.google.com/android/android-sdk_r24.0.1-linux.tgz
Import apt version 2.6.0
Merge pull request #416 from travis-ci/db-collectd-docker-lvm

Docker LVM Collectd plugin
Normalizing unit of measure to KB :rage: :fist:
Add check for start hook executable in run script
Update `nvm` to v0.20.0
Merge pull request #419 from ljharb/update_to_nvm_0_20.0

Update `nvm` to v0.20.0
Update git
Merge pull request #420 from travis-ci/db-travis-worker-start-hook

Add check for start hook executable in run script
Upgrade virtualenv to 12.0.2
Merge pull request #421 from dstufft/patch-1

Upgrade virtualenv to 12.0.2
Upgrade virtualenv to 12.0.4
Merge pull request #422 from dstufft/patch-1

Upgrade virtualenv to 12.0.4
Update rvm to 1.26.6
Update to Ruby 2.2.0 release
Update JRuby to 1.7.18
Update changes.md
Update Node.js to 0.10.35