Add support for Python clients

[robertmaynard]

We need the ability to generate a python interface to the client class.

This would allow remus users to write python client code, and interact with a c++ worker.

from remus.common import MeshIOType
from remus.meshtypes import Model, Mesh3D
from remus.client import ServerConnection, Client
from remus.proto import JobSubmission, MemoryJobContent

conn = ServerConnection()
client = client( conn )

request = MeshIOType(Model(),Mesh3D())
if client.canMesh( request ):
  workerRequirements = client.retrieveRequirements( request )
  sub = JobSubmission(workerRequirements[0])
  sub["data"] = MemoryJobContent( "Hello from Python ")
  j  = client.submitJob(sub)
  state = client.jobStatus(j)