Add salt formula for mongodb.

From a cloned copy of crits, run 'git submodule init &&
git submodule update' to properly setup this git submodule.
Add initial vagrant setup.

Add initial Vagrantfile. The CRITs dev system has a private IP of
10.10.6.100 and is provisioned by salt.

To speed up provisioning, the aptitude system cache is mapped to
an ignored folder in the repository. Pip is configured similarly,
but unlike apt happily creates the directory if needed.

.gitignore updated accordingly.
Add initial salt states for CRITs dependencies.

These simply salt states install current CRITs dependencies and
essentially bootstrap the installation process up to the step
where the administrator needs to add a Django SECRET_KEY by
copying the example database settings.

Dependencies are split in two categories: system requirements
installed by apt and python requirements installed by pip.
Use curl to aid in provisioning behind HTTP proxies.

Complements to @dsnellgrove for the fix!
Update python dependencies.
Merge pull request #118 from Locker537/vagrant

Easy local development environment  using vagrant and salt