added acousticness to AudioSummary and fixed testcase
add liveness & speechiness to AudioSummary
added min/max acousticness, speechiness & liveness to SearchParams (and a test for it)
added valence attribute to AudioSummary
added min/max liveness,acousticness,speechiness,valence to Playlist
added liveness/speechiness/acousticness/valence as sort params for Playlist & extended tests
uncomment testDynamic2(), remove strict sort checking
Merge pull request #6 from Horrendus/master

added some Info to AudioSummary & additional SearchParams