Provide a JSON-RPC API

Provide JSON-RPC calls to the AtomSpace methods and server requests system. It should designed in such a way so that the system can be extended relatively easily for XML-RPC and perhaps even Google's Protocol buffers. Requests to support should include:

    * Create and delete atoms.
    * Retrieve sequences of atoms based on search criteria (getHandleSet equivalent).
    * Get the incoming and outgoing sets.
    * Modify importance and truth values.
    * All the cogserver requests (means dynamically adding new JSON methods when modules that provide new requests are loaded).
    * Request for all available methods.