Add the ability to register and receive invocations of local RPC methods. Note that this CL does not yet have testing.
- Add a CallResult struct and helper methods for easily construction CallResult's in RPC handlers
- Fix client to only return the roles instantiated
- Handle errors in RPC handlers
- Add a client test suite that tests HELLO, CALL and REGISTER.
Merge pull request #55 from josephschorr/v2-rpc

Add the ability to register and receive invocations of local RPC methods