Add ability to refresh() a single or array of prop rather than all props

[billneff79]

The current refresh() method refreshes all props, which could be quite inefficient if there are many wired up and you only need a subset of them refreshed. Would be useful if it could handle something like refresh('prop1') or refresh(['prop1', 'prop2'])

[pl12133]

Maybe we could mimic pending and rejected here and have refresh be an object with properties for each prop:

this.props.refresh.prop1();
this.props.refresh.prop2();

// How to refresh all?
this.props.refresh['*']();
this.props.refresh.all();

[developit]

Only issue I have there is that it's more surface area we'd have to generate. My inclination is towards keeping things as simple as possible here - just an optional prop name (singular).

[pl12133]

I think I like the solution of refresh accepting a comma separated String or Array of String for refreshing given props the most:

this.props.refresh('username'); // Refreshes only the `username` prop.

this.props.refresh([ 'username', 'foo' ]); // Refreshes both the `username` and `foo` props.
this.props.refresh('username,foo'); // Same as above, using comma separated values instead of Array.

this.props.refresh(); // Refreshes all props