Eval in doco; Evaluate in code.

[mattsmi]

The documenation (Readme.md) states to use "env.eval()" to have CLIPS code evaluated as if entered into the CLIPS command line interface. However, this does not work. Your code has the function defined as "evaluate". Is there a reason for that?
Thus either change the code to "eval" rather than "evaluate" (preferred option, as this matches with CLIPS usage elsewhere) or change the documentation.
PS Great work!