Beta nesty extractor
Nesty extractor works.
Consumption only removed past types.
Merge branch 'master' into consume

Conflicts:
	core/src/main/scala/edu/knowitall/taggers/tag/OpenRegex.scala
Merge branch 'master' into nesty

Conflicts:
	examples/chunkedextractor/reverb-parts.taggers
Merge branch 'master' into nesty
Improve typechecking messages and don't typecheck subtypes.
Improve nesty taggers.
Merge branch 'consume' into nesty
Fixup: test case.
Fix example in webapp.
Merge pull request #44 from allenai/nesty

Add nesty extractor.