Implement getting name representing of item iterator.
Make correct MediaInformation class.

 * rename it to correct class name;
 * add few neccessary tags to media info;
 * implement setters for all tags.
Add initial implementation of getting media tags.
Fix test with empty media information.
Add and implement method for getting some date from observer.
Add initial implementation of getting date from item iterator.
Add missed library to MediaTests.
Fix order of cleaning projects.
Replace tests mp3 on sinus sound with tags.
Add information which must be added to resource preparation.