FIX: Method name normalization in server stub generator

This JSON file
```json
[
    {
        "method": "foo.bar",
        "params": null,
        "returns" : {}
    }
]
```

was converted in 
```cpp
this->bindAndAddMethod(new jsonrpc::Procedure("foo_bar", jsonrpc::PARAMS_BY_NAME, jsonrpc::JSON_OBJECT,  NULL), &AbstractFooBarServer::foo.barI);
```

Now conversion is 
```cpp
this->bindAndAddMethod(new jsonrpc::Procedure("foo.bar", jsonrpc::PARAMS_BY_NAME, jsonrpc::JSON_OBJECT,  NULL), &AbstractFooBarServer::foo_barI);
```