- made ListParser public
- made choice and sequence parsers 5% faster by using non-growable lists
- added greedy and lazy variations of [Parser.star], [Parser.plus], [Parser.repeat]
- updated README.md with info about the status
- bumped to 0.5.0
- fixed some typos in readme
add "parserExtension" and tests
Merge branch 'master' of https://github.com/freewind/PetitParserDart

Conflicts:
	lib/petitparser.dart