placeholders for two new recipes
Added jsinterop example using mrhyde
Added ClojureScript boids example

The example is long, so I thought it was useful to split out the interesting core ideas. Of course, this made it longer which in other ways defeats the purpose. Guess that's why I'm not an editor. :-P
Merge pull request #241 from dribnet/master

Two new ClojureScript examples: jsinterop and boids