ENH: Added .gitignore file
ENH: Added Neurobehavior's cns.chaco_exts
ENH: Added method to calculate PSD of EpochChannel
BUG: Point to correct module for Channel class
BUG: Ensure EpochChannelPlot updates on resize
ENH: Added new plot to show FFT of channel
ENH: Added arraytools utility module
ENH: Updated FFT plot to support dB scale with ref