Always write the supervisor files and link them as necessary.

Drop the configs in the supervisor available directory. Instead of having a
seperate cfg dir for each service.

Seperate devstack logic from disabling supervisor tasks. Add the new flag so
devstack continues to not startup supervisor. Use new supervisor_available_dir
everywhere.

Remove mongo logic from abbey and remove stage_release. This should completely
remove our tie ins to mongo.

Also removing monitor repos script which depended on stage_release. We can add
in similar logic when we're ready to automate building the AMIs on rc branch
creation.

Updated requirements.

Moved headless browser config into a separate role
Added localdev role
Configured login shell for edxapp and forum
Added host update for Studio preview (preview.localhost)
Use custom base box for devstack
Added troubleshooting section to README

* consistent jinja variable syntax
* comment blocks on the tasks/main.yml files
* some syntax errors, variable name issues
* indenting, breaking up long lines
* various bug fixes

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