First commit towards moving to spray.
Move from unfiltered to spray.
Add some comments.
Remove Example.scala.
Fixup: build break
Rename aggregating project taggers-root.
Comment Rule parser combinator.
Adjust parser combinator to handle comments.
Fixup: actor system name
Merge branch 'master' into spray

Conflicts:
	core/src/main/scala/edu/knowitall/taggers/example/Example.scala
Merge pull request #29 from allenai/spray

Switch to use spray