pass concordance & update examples

[cqx931]

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[cqx931]

1. The grammar example now uses json file. Are we going to support yaml format in the future?

-- yes, no more yaml, either json or (native) riscript

2. RiScript compiler doesn't take variables that start with non_alphabetic characters(Ex: $1, $<2>), could some error messages be added here to help people migrate from the old rita?

Indeed. We need some combination of better docs, better error messages, and/or useLegacy() or convertGrammar() function that either runs or converts old style rita grammars. The basics of the last are easy, but the back-ticked expressions are likely impossible.

Additionally we can also add support for rules starting/ending with <>...