GPII-716: PCP's method for interaction with FM via WebSockets should be more declarative

Link to JIRA: http://issues.gpii.net/browse/GPII-716

This pull request is strictly connected with Websockets communication from PCP to FM (http://issues.gpii.net/browse/GPII-539) and is not related to the pilots.
this seems like it should be a member instead of an option. You can specify members in the grade/component's defaults like:

```javascript
fluid.defaults("gpii.pcp.socket", {
    ...
    members: {
        socketConnected: false
    },
    ...
});
```
You'll then be able to access it directly off the component like `that.socketConnected`