Added Modulus deployment.

Uses the configuration options of: Token (the user's Modulus API token) and
project (the project to deploy to).
Add Modulus to deployment class.

Allow the Modulus deployment type to be used.
Fixes.

Fixed the WriteEnv usage and updated to allow for sudo if necessary.
Corrected project usage.
Merge pull request #116 from fiveisprime/modulus-deployments

Adds support for Modulus deployments