some misc functions etc, first attempt at bluetooth + spine plot
rewriting spine plot curve and related functions. removed use of
kinetic.animation as it seems too power hungry (which may be causing
dropped packets). now, just updating and plot, no fancy transitions etc.

Also includes sanity check code to check if received array length =
expected (i.e. no falsy values in received array)
some arduino code
1_2 is flex sensors connected directly to arduino, side sensors uses
analog mux, I think.

1_3 is a simulation of angles, looped for bluetooth phonegap app.

bluetooth baud rate updater that doesn't work