Re-render markup when components prop changes

[d3x7r0]

Fix for issue #25: change the shouldComponentUpdate function to allow re-rendering when the components prop changes.

[developit]

It's weird that Github isn't showing the easy "update" button - I fixed the test runner issue on master.

[d3x7r0]

I rebased with master anyway, that should get Travis running

[d3x7r0]

Hey, can we get this merged? It would really help in my current project.

[danielweck]

This PR looks like it could / should be merged? :)

I would just change this comment:

// one of the components changed:

...with:

// one of the components changed, or a new one was added:

(to more accurately describe the possible cases)