Move type_extensions from test dependencies to regular dependencies

Rename Variable.bind_to to Variable.bind (#73)

39 flatten Values for associative operators (#65)

* Make combining constants return a constant
* Make encapsulating Values with associative functions flatten to single Value

Implement BoolValue.select (#63)

Make derived values bind weakly (#51)

Add operations to IntValue and FloatValue (#40)

Add publish job to github actions (#36)

Rename job build to test, since it really only tests

Add __version__ to __init__.py and add pytests (#32)

Merge pull request #22 from FancyNeuron/20-create-readme

Add README.md, along with some tests for code from the readme

Merge pull request #21 from FancyNeuron/18-make-variablebind-use-new-…

…weak_observe-method

Make variables bind weakly