Add rake task to setup dotenv.

Invoke with `rake dotenv_init` and will write `.env` to project root
dir.
Merge pull request #11 from rondale-sc/dotfile_creator

Add rake task to setup dotenv.
Create wrapper method to simplify Rakefile.
Merge pull request #12 from rondale-sc/dotenv_tiny_refactory

Create wrapper method to simplify Rakefile.
Fix CreateUserDataBag fixture.
Refactor EC2 commands into utility class.
Merge pull request #13 from rjackson/refactor_ec2_into_class

Refactor ec2 into class.