rbenv install requires curl or wget, if none of them is installed, the
role fails.

Removed upstart scripts
Removed Python install scripts
Combined xvfb and browser playbooks
Changed Jenkins user base to /home/jenkins
Added wheel dir creation
Moved jenkins_env script
Changed data directory to /var
Install newer version of rake in rbenv role
Added edxlocal role
Remove system packages already installed by common and edxlocal
Added list of Python packages to pre-install

rbenv dir

These are some minimal changes to support 1.3, does not yet include role
dependencies.