Updated Git Ignore with directories.  Starting Pandas learning
Fixed Notebook Demo CSV writer
A gitignore file for the built-in documentation diagrams directory, and that should close issue https://github.com/NAVADMC/SpreadModel/issues/144
Reverted git ignore.  Learning Pandas notebook.
Merge remote-tracking branch 'origin/master'
Set a default maximum days for simulation to better comply with #20
More learning Pandas.  Pandas is hard!  But very powerful.
Refactored OutputManager into output_parser.  Switched Simulation to run .communicate() and capture stderr.  Various improvements to #111
Bug fix for "Edit" icon.  No Issue
Refactored process listener (again) so that it would not wait until the simulation was done.  #111
Demo for #147
Implemented Population map for #147
Changes to add a command line argument for starting iteration number, as requested in issue https://github.com/NAVADMC/SpreadModel/issues/134 . New option is -i for short or --iteration-number. Iteration number is now contained in the BeforeEachSimulation event.
Cleaner refactor for #147
Implemented changes to FloatFields for #145
Merge branch 'master' into Windows