Add rendering of multuple stories to story.render

Method checks if given argument is array,
if yes, return set of results of story.render (itself) for every element,
if no, then this is just one story object, render it.
Render all the stories on page with single story.render call

See #0dae4b.
Add grunt-contrib-qunit to devDependencies

Let's use QUnit for testing.
More info:
http://bit.ly/ZemGxg (manual)
http://qunitjs.com/
http://phantomjs.org/
Add QUnit to test/components
Add jQuery to test/components

QUnit doesn't need it, but this project does.
Fix quotes (switch to double-quotes) in Gruntfile.js
Fix whitespaces in Gruntfile.js
Fix comments (switch to // if one-line comment) in Gruntfile.js
Add QUnit grunt task

Add task, load npm task, add to default task after jshint.
Merge branch 'develop' into feature-unit-testing
Fix: add new line at eof in Gruntfile.js
Merge branch 'develop' into feature-unit-testing
Add test/index.html

This is going to be testing index file.

Add links to:
- QUnit css
- jQuery (for this project)
- all common project js files
- QUnit js
- tests.js (which doesn't exist yet)

Add div#qunit for QUnit results and other stuff,
add div#qunit-fixture for html, which will be available during every test.
Add sample ithappens content to QUnit fixture html
Change one story in sample content with simple one

- set story id to 42
- set title to "Story title"
- set rating to 9001
- set text to "Story content."

Leave date and story tags the same for now.
Add id "sample-story" to, guess, sample story

This is for easier selection during test preparation.
Changed story tags of sample story

One story tag is enough.
Also add id to container so it's easier to select it.
Fix QUnit urls in test/index.html
Fix ithappens logo url in test/index.html
Change original logo selector in app.getBaseHtml

Replace "equals" selector with "contains".
This is mostly for unit testing: in local testing html logo has full link url
(with domain, etc.), but contains the same path. This is the easiest solution
to this problem.