added config for Jest tests location

tests/preprocessor.js

@@ -1,9 +0,0 @@
-// preprocessor.js
-var ReactTools = require('react-tools');
-var to5 = require('6to5-jest').process;
-
-module.exports = {
-  process: function(src, filename) {
-    return ReactTools.transform(to5(src, filename));
-  }
-};