works from scratch on gce and better generalization

missed file

changing user for checkout task

reverting path change

fix typo

fully working on debian

working upstart

moving env from bashrc

removing unused template

adding template for ruby env setting

removing unused template

removing forum and ruby env from bashrc, general cleanup

Feanil/vagrant updates

Swap lms and lms-xml nginx ports and remove edxapp_sandbox.yml from vars_files because it no longer exists.

Putting migratedb in group_vars/all overrides any vars
in playbook files and so migrations never get run.

In regular runs it seems to have no side effect but fails for vagrant runs.

Feanil/ansible workers rebase

This also makes it easier to conditionalize it since it
doesn't need to be run on workers.

Jarv/ansible version fix deploy

Fixes bug where WORKERS was sometimes being set to "NAN"

For the case where  "ansible_processor_cores": "NA"  and
facter_processorcount wasn't the WORKERS was set to the string "NA" *
the multiplier (like batman).
This will try to convert both to numbers and if the conversion fails it
will fall through and just set the WORKERS to the multiplier.

Jarv/single instance fixes

removing README.md content in favor of the wiki