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.
In clojure version it does change: https://github.com/quil/quil/blob/master/src/clj/quil/applet.clj#L231. 
In clojurescript it doesn't so there is no need to use atoms.