dalekjs/dalek — pull request #141 by gskachkov (2014-09-28 05:50:25+00:00)
Title:  Fix:create custom assertions via callback

Implemention of the following feature https://github.com/dalekjs/dalek/issues/123 - Custom assertions via callback

Examples of using
```javascript
test
.open('http://dalekjs.com/index.html')
.assert.evaluate(function () {
return document.getElementsByClassName('grid').length;
}).is(2, 'Count of grid on page is equal 2');
```