Clean up and remove unnecessary code. One last change to mappings.py; I wanted the features to be ordered from lowest to highest index. Thus, mappings.py now stores a tuple representing a mapping of (attribute, specs)
Clean up parser / histogram to take in float values. You still hae to adjust the histogram manually if you plot int / str values
So...NB is now giving 0.033697 as an error, but don't know if this is legit