put production rate function on nuclides
calls to super, store prod in instance variable
return full function so we can add docstring later
remove some dated, un-needed examples
make use of prod rate on nuclide objects
make sim function interface more consistent
add version dunder and bump to 0.2.0
add ISRELEASED in setup
fix profile plot example
fix neighborhood algorithm simple example
Merge pull request #10 from zploskey/nuclide_obj_production

Nuclide object production rate function and other improvements