features: add-nodes and adding a webserver to serve as an HTTP API

## add nodes

```monster add-nodes --compute-nodes 2``` will add two compute nodes, uniquely named, to your deployment and put them under control of the chefserver. 

----

## webserver (using pyramid framework)

From within a suitable virtualenv (make sure to run `pip install -r requirements.txt` to get the new package requirements), run ```python monster-api/pyramid/hello_deployment.py```.  This will start the server on http://0.0.0.0:8080.

Currently, the only route that is defined supports GET, POST, and DELETE requests to
```
http://0.0.0.0:8080/rpcs/deployment/{name}
```

Hit the url with 

```
curl http://localhost:8080/rpcs/deployment/my-deployment -d '{ "dry": false, "secret": "secret.yaml", "orchestrator": "chef", "name": "my-private-cloud", "template": "ubuntu-neutron-lite", "branch": "4.2.2", "destroy_on_failure": true, "provisioner": "rackspace", "config": "pubcloud-neutron.yaml", "log": null}'
```

This will initiate a build that's the equivalent of the command:
```
monster build rpcs my-deployment -c pubcloud-neutron.yaml -t ubuntu-neutron-lite -o chef -p rackspace -b 4.2.2 --destroy-on-failure
```

Hit the url with:
```
curl -X GET http://localhost:8080/rpcs/deployment/my-deployment
```

This is the equivalent of:
```
monster show my-deployment
```

Hit the url with:
```
curl -X DELETE http://localhost:8080/rpcs/deployment/my-deployment
```

This is the equivalent of:
```
monster destroy my-deployment
```