Add reference to log parsing vignette
Properly escape backslashes

We were not escaping them at all before!
Simply regexs generated from 'some_of' et al.
Add locations argument to re_matches
Improve rex-mode documentation

closes #21

Thanks @Ironholds for the pull request!
Clear up wording for re_matches documentation
Update NEWS.md for 0.1.1 release
Update DESCRIPTION so that only Jim is a maintainer