This directory hierarchy is organized like so:
    /checkstyle-reports    contains output files form running Checkstyle
    /doc                   contains miscellaneous documents
    /etc                   contains the Checkstyle config file and other metadata
    /lib                   contains the .jar required to run Cehckstyle
    Makefile               a driver for creating complexity data for further analysis
    /mathematica-input     contains generated data files suitable for reading into notebooks
    README                 this file
    /reports               contains Mathematica notebooks analyzing data
    /targets               contains subdirectories holding the Java source code to be analyzed