Command to deploy a new service is needed

[Gustavo Niemeyer]

We need a command which is able to be called as:

    $ ensemble deploy --repository /my/formulas/ wordpress

This command should:

    1) Verify that the service name is available for creation (since no explict name was provided, "wordpress" should be used) through the ServiceStateManager (depends on bug #616485)

    2) Find the "wordpress" formula in the repository and upload it to the environment (depends on bug #616478)

    3) Create the new service state with the "wordpress" formula (depends on bug #616485)

    4) Create a new machine state for running this service (depends on bug #616487)

    5) Create a new service unit with the created service and assign it to the created machine (depends on both #616485 and #616487)

Note that, during that initial development phase, every service unit will live under its own machine. In the future, this will be changed so that cohabiting a machine is possible.