= add some more README content
= fix "Invalid rule definition" error with certain actions, fixes #41
+ extend `run` action with support for rule expansion
= (re-)enable unwrapped rule results in `~>` and `run` actions
= examples: add small optimization in JsonParser
Make ParseError generation optional. Related to https://github.com/sirthias/parboiled2/issues/10

FIX BUG when `def ruleFrame` differs from actual rule frames saved in
catch block