Waxeye

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* Added Javascript language target

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* Added Python language target

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* Added C language target

* Added calculator examples for C, Java, Ruby and Scheme

* Changed multi-line comments to `/\* \*/` style

* Changed wildcard symbol in grammar tester from `\*.` to `\*`

* Improved error reporting

* Improved build system syntax

* Improved code generation backends

* Upgraded Waxeye codebase to PLT version 4

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* Added vertical pruning non-terminals

* Fixed nested closure generation

* Fixed bug in nested unwinds

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* Added ruby target

* Added new java target

* Added new scheme target

* Added case-insensitive strings

* Moved to new runtime design

* Moved to MIT/X11 license

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* Added Scheme-based build system

* Fixed Error Reporting for Grammars