Add support for testing component

[arunoda]

With our states, prototypes and actions it's very easy to do both unit tests and integration tests.

Unit testing will be simple. All we need to do it a expose these via some API. May be we can use FlowComponents.find() for this.

For integration testing, we need to find a way to render the component to the dom and do call actions and check states. For that, we need some kind of testing tools.