Add react-runtime and react-testsuite

These are last pieces.

But I found that atmosphere 2.1.x doesn't work with sse. So now I specified to use 2.0.x. Here is relevant HTTP full text.
https://gist.github.com/flowersinthesand/9543048

In atmosphere 2.1, secondly set headers are ignored but it doesn't break test suite.
https://github.com/flowersinthesand/react/blob/runtime/react-runtime/src/main/java/io/react/runtime/DefaultServer.java#L84-L85

The problem I think is here.
https://gist.github.com/flowersinthesand/9543048#file-atmosphere2-1-1-L14