Treetop grammar working with everything except mixed expressions evaluation.

Added functions to rules.

Rolled Treetop debugging code into my own wrapper pulled from runme.

Treetop grammar created.

Created Uparse class to handle the grammar DSL. Created base grammar for Yinlang.

Fixed the operator rule. Simplified space rule. Comprehensive debug output.

Started building my own basic parser.

Simplified some of the code, added some tests.

Added custom Exception to dump out more information. Added start of mixed expression functionality.

Subtraction done.

Completed additive expression basics.

Basic addition example.

Sketched out some syntax and built up basic stubs.

Initial commit with bundle gem.