add Parameter.set() method to update Parameter value, attributes
add __add__ to Parameters
move selection of minimize method from minimize function to minimize method
working model with no params
update models to use new Model class
updated tests for new model class
updated examples for new model
Model.fit() allow params=None to auto-create uninitialized params
simplified doc_model1 example
remove deprecated anneal()
update some examples
add test of copying model params
Fix typo
Merge pull request #108 from tritemio/model_noparams

Fix typo Thanks!!
parameter can have max but no value and no min.
added parameter hints to Model: _param_hints and _set_param_hints() to set default vals/attributes
updated subclasssed Models to use Model._set_param_hint
better syntax for Model.set_param_hint()
add mailing list / issue track links to doc sidebar
allow prefix or not in model.set_param_hint()