Lower Vorbis quality level to more sane values and adjust MP3 quality


See http://wiki.hydrogenaud.io/index.php?title=Recommended_Ogg_Vorbis#Recommended_Encoder_Settings and http://wiki.hydrogenaud.io/index.php?title=LAME#Recommended_encoder_settings
Merge pull request #656 from sfan5/patch-1

Lower Vorbis quality level to more sane values and adjust MP3 quality