Yield more informative exceptions when pattern parsing fails.
Add relnoun taggers.
Allow type names to contain a single period.
Fixup: regex
Fixup: regex
Refactor reverb into two files and tweak relnoun patterns.
Remove inappropriate relnoun.
Remove -ist relnouns and cover them with a .*ist regex.
Merge pull request #34 from allenai/relnoun

Add relational noun extractors.