* adding utility class for calculating word shapes
 * adding vector printing utilities for debugging
 * fixed training code thanks to a very long debugging session using crfsuite as a baseline
 * training code actually works now!
 * adding a chunker executable that runs with the CoNLL 2000 shared task data (which is publically available)
 * fixing the absolute value check in the finite difference printing code and tightening the bounds upon which it acts