ProcGUI: merging spectrogram into this code base
ProcGUI: created EEG_Processing class
ProcGUI: moved constants into OpenBCI
ProcGUI: comments and fix char sending to OpenBCI
ProcGUI: works with 12-electrode Scalp#9 Config
ProcGUI: changed channel button text to < nchan
ProcGUI: include polarity in headPlot
ProcGUI: make polarity switchable.  Prepare for merge.
ProcGUI: fix to make work displaying fewer channels than in data packet
ProcGUI: clean up some comments and spaces
ProcGUI: handle nchan < nchan_OpenBCI
ProcGUI: fix rowsWritten counter
ProcGUI: fixed nchan < nchan_OpenBCI for real
Merge pull request #20 from chipaudette/master

ProcGUI: improve headPlot (polarity!) and create EEG_Processing class