No lexer yet, that is still planned for a future release, but there are other improvements that need to be made first. Here is what was done in this release:

- parser improvements
- lazily initialize defaults
- improve source maps for non-file-based strings
- ensure pos is defined in error messages
- remove unused util
- adds toRegex method (this seems like a sane decision, since many use cases for this include conversions to regex. However, I will probably move this into a snapdragon plugin in the near future)