i should really commit more often

features added:
-cli's support specific file names or a folder name, where the files
conform to the convention 'SHCI-[#][a,b,c,d] DS.mp3'
-finds and processes files with LAME if necessary. it will try to find
previously processed files to save time
-uses audiolab to convert soundfile into numpy array and extracts useful
metadata from soundfiles
-processes single audio files by:
   -condensing sound data into one channel (stereo -> mono)
   -flipping negative values to accurately and smoothly measure volume
   -condense data into chunks whose size are specified by the 'quotient'
   input
-cross-normalizes all 4 data files, and shoves data in between 0 and 1
-tests against a static silence threshold, and prints results as a CSV
file

todo:
make the silence threshold smart and dynamic
actually write to a file
post-process CSV (to account for gaps in speech)