Update ObjectiveFlickr to 2.0.4

This pull request contains two specs, one for 2.0.3 that updates the library to use the SSL endpoints (see [Flickr's announcement](http://code.flickr.net/2014/02/24/new-ssl-endpoints-for-the-flickr-api/) for details), and one for 2.0.4. The latter has a minor fix and includes two sample apps that use CocoaPods.