Basic YouTube search when EchoNest fails to return what we ask for.

This is fixes issue #25.

- If no songs are returned for an artist, do a basic YouTube search. 
- If no artists are returned when doing a similar search, do a basic YouTube search.

**NOTE:** This is my first attempt at doing something besides comment shit out, if this sucks... let me know why and what can be done to make it better. It does work for me though, so I'm at least pumped about that :cake: