Changed image to use the lastest build (based of Ubuntu:14.04LTS)
add-apt-repository is now in the software-properties-common package
The postgresql-client default is now 9.3
update ruby to install 2.1
Removed ruby-switch as it is no longer available for Ubuntu:14.04 (see http://askubuntu.com/questions/452243/what-versions-of-ruby-are-supported-in-14-04)

Is it required now that Ruby 2.1 is out?
An issue with OpenSSH, when an account is locked it doesn't check the authorized_keys file anymore (see http://grid.ncsa.illinois.edu/ssh/ts_server.html, http://stackoverflow.com/questions/15664561/ssh-key-asks-for-password)

Running passwd -d git fixes this
Merge branch 'arnos-Ubuntu_14.04'
fix supervisord warning message
use sameersbn/ubuntu:14.04.20140505 base image
updated changelog