Create Manager Node (ContextCoordinator Agent)

### Why
In the context-as-a-service vision, the management of a spatial ContextDomain (e.g. lab 308) is done by a separate processing unit, called the _Manager Node_. It is responsible for managing all the SensorNodes that register _capabilities_ under the same ContextDomain, as well as answering to queries from the _User Nodes_.

### What
* [ ] create python-based web server that acts as the backbone of the ManagementNode
* [ ] implement means to configure, launch and communicate with Corese from the ManagementNode

### Notes
Use a .yml configuration file for setting up parameters related to Corese RDF server (e.g. IP, port, important URLs)

Use python subprocess initialization calls to start the Corese server according to configured parameters.