made repr of some core classes more sane
added test for model pickling
cleaned up implementation of ANY/WILD (no longer monomers)
added docstrings for ANY and WILD
cleaned up docs to eliminate a bunch of sphinx warnings
deleted some orphaned doc files
start to rewrite tutorial
tutorial rewrite - through Monomer
tutorial rewrite - Parameter and start of Rules
Merge remote-tracking branch 'johnbachman/exporter_refactoring'