Cross-platform tests for Quil

To run tests use:

1. ```lein clean```
2. Compile it:
   a. ```lein with-prifile test-1.5.1 compile``` for Clojure 1.5.1
   b. ```lein with-prifile test-1.6.0 compile``` for Clojure 1.6.0

3. Open ```test\html\test.html``` and push ```run``` button


You can see results on html page. You find errors in browser dev console.
I don't understand why we use
```clojure
(atom {:target-frame-rate (atom 60)})
```
and not
```clojure
{:target-frame-rate 60}
```
What is the point of using atoms here?