Splitting "Mount" into "ConfigureComponent" and "Mount".

In order to have more control over how React components are being instantiated, the ```Mount``` component was split into two components:

* ```ConfigureComponent``` now passes a set of properties to a React component during instantiation and then passes the configured React class to the out port.
* ```Mount``` now receives a pre-configured React class on the in port and mounts it to the container specified on the "container" port.
* The ```Render``` subgraph was modified to work as before, by passing an empty object into ```ConfigureComponent```.