Added Modulus support.

Includes Modulus provider class to deploy a project using the Modulus
command line interface as well as updates to the usage documentation.
Updated to use the option function.

This will force an error to occur if either of the (required)
parameters are omitted from the command.
Added rspec test.

Updated the validate the api key and project name parameters as well.
Merge pull request #88 from fiveisprime/modulus

Added Modulus support.