updated all code

1) no longer contains post-processing (associated functions CarenRead,
filename_parser, process_data, and record_module_read) and just loads
from a file containing time, Mx, and belt velocity
2) docstrings updated and corrected
3) compensation_test.m updated to load new files and some minor
stylistic changes
4) frequency graphs now included dotted line at the desired cutoff
frequency
5) simulation plots now include the R^2 in the legend
6) simulation and calibration functions now use the filter function
instead of the for-loop
7) data is not clipped after filtering and is instead clipped after the
simulation has been performed
8) taking the derivative is now an option that can be commented out in
the compensation_test.m script.
9) all associated data files uploaded