fix typo

updating the master edx_sandbox play

removing commented out roles in the sandbox play

forum role cleanup

Fixing upstart script to source env.

* 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

fixing handling of ssh keys

DO NOT MERGE: initial commit of forum related roles

Use different port for each service.

Feanil/multiple vagrants

for edxapp, install python sandbox requirements into regular venv

Initial definition of the worker boxes in cloudformation.

Extract the app port numbers into the vars file.