HG-332 Linked images

Handle images that link to other articles.

Related Wikia/app change: https://github.com/Wikia/app/pull/5340

https://wikia-inc.atlassian.net/browse/HG-332
I tried Em.computed.gt but couldn't get it to work. Ember threw an error with "this.get('limit')" as the second parameter. Is there an advantage to using Em.computed? Is it faster?