Remove numbering from levels.
Fixup: forgot Level.scala
Add imports to levels.
Relnoun and reverb examples work.
Delete cascade examples.
Add typechecking when Cascade is created.
Update Kevin's chunks cascade to use new syntax.
Remove Taggers.scala.
Don't allow extractions to be followed directly by another relation.
Use a more complicated noun chunk in reverb.
Fixup: bug in cascade application
Add import to relnoun extractor.
Rename relnoun extractor file.
import Rel/RelTo at every level to block reanalysis
Merge pull request #40 from allenai/import

Use import instead of types propagating only a single level