Removed old 'BetterLexer' that used regex, which was never finished being implemented anyway
Improved documentation, added initial outline of Evaluator class
Further fleshed out REPL loop and outline of Evaluator. Also fixed Sphnix documentation (prev used optional [] syntax for required method arguments)
Fixing previous misunderstanding about lambda-expressions (terms/bodies are denoted by parentheses to disambiguate terms/bodies vs. application)
Renamed 'term' within lambda-abstractions as 'body' to prevent confusion with 'term' which describes everything in lambda calculus.
Evaluator.raw_eval now appears to work correctly. Still need to add more tests, since current ones are not very stressful.
Evaluator complete for simple expressions. Still need to add ability to evaluated nested lambda expressions.
Lambda calculus interpreter, specifically the Evaluator and Parser, is now fully functional (not fully-tested, but moderately stressful tests have passed)