HCYoutubeParser has been fixed // add only one url per one quality key

I had an issue that videoDictionary contained two equal keys, that broke the payback: two videos were playing at the same time instead of one. HCYoutubeParser should return videoDictionary with unique keys.
Merge pull request #22 from DmitryKhryukin/master

Unique quality keys in the video dictionary
Merge remote-tracking branch 'upstream/master'