rename examples/demo/ -> examples/editor/
resolve #35 NeuContext#toSeconds() accepts a { playbackTime:number }
resolve #40 $(AudioNode) supports binding to their properties from {}
clean: order of properties defining
resolve #38 add .start() .stop() .reset() to Neume
resolve #32 support UGen pipeline
change Neume.Synth() uses new neume.Synth() directly
refine PeriodicWaves square, sawtooth, triangle
add neume.KVS
remove $("osc") pulse
update $("osc")
add $("lfpulse")
update $("noise")
update $("shaper")
update $("pan2")
update $("env")
update neume.Param#update() supports a lag argument
change neume.Synth fade curve

  - use setTargetValueAtTime -> linearRampToValueAtTime
fix $.stop()
update examples