Model Generation + Automatic Code Format

[stanleybak]

This is a recent set of changes which has the following items:

• Added support for model generation, as well as the chains of integrators benchmark and nav benchmark model generation. Added unit tests for each of these, and a hypy script for running a geneartor in the doc folder.
• Added command-line help for model generation (GUI can't do this yet).
• Added more parameters to pysim printer (tool parameters like desired simulation time, plot title)
• Added auto code reformatting to ant script (if eclipse is detected on PATH), as well as instructions in README on how to setup reformat-on-save. This is related to Uniform code format for Hyst #34 .
  -Reformatted all code files according to the code standard.
• Put all matlab tests into one unit test file. Currently this is printing an error message rather than running the tests until matlab detection is fixed (see matlab unit tests fail #32 ).

Please review and accept/comment Taylor.

[stanleybak]

I updated this to fix the constant substitution bug rajray encountered: #36