Added more to autumn leaves example
Added basie files
Added DRUM_KIT in arezzo.instruments
Added simpleHats pattern
Renamed instrument instance var and function to stop confusion python
Extend walkingBass so we can have different patters
Added more patterns in walkingBass
Drum staff in al_mid
Added hack to make sure the drum staff always goes to channel 10
Add build_and_play
Export simpleHats from basie module