Adding FFT

Adding FFT script based on Bernardo's Spacebrew example
Background responding to music

Successfully linked the audio input to the background!
Background adjustments

Shape animations now smooth. Assigning a direction instead of absolute
position.
Background fully operational!

Some more adjustments + new rotation mode
GUI Threshold

Added threshold to GUI.
Merge branch 'master' of https://github.com/gianordoli/nws