add interpolation node
don't allow picker to go outside top/left bounds
add node settings bubble
add int node
rename generator nodes
fix backspace blocking on inputs
modify settings styles
transmit values from setting to node
add pubsub
hide settings when clicking on blank space
add playing property to scene
update number value on drag when paused (fix #6)
move all class names to special object
improve scrollbar interaction, fix #9
add min/max nodes
add time node
create base class for all control nodes
add knob node stub
calculate picker sublist direction
add background node (fix #13)