Bug fix/118 return precise requested name

[danielcliu]

_get_item_from_search_response() will now search through all of returned "hits" to find the matching string for the requested song title/artist name. If no matching string is found, the top Genius result of the correct type_ will be returned, and if the genius API returns nothing then None will be returned.

[danielcliu]

@johnwmillr Has this been approved? All I see is that you requested yourself for a review. I'm not super used to the Github interface

[johnwmillr]

Resolves #118