Repilfer Unidoc from Akka for SBT 0.12.
Remove deprecated repositories.
Clean up and update dependencies.
Cross build for Scala 2.9.2.
Merge branch '2.0.x' into 2.1.x; fix multipart bug.

Jetty 8.1.8 uncovered a bug in FileUploadSupport where we tried
to get the parts of a single-part request.  Fixed in this commit
to be green.

Conflicts:
	project/Unidoc.scala
	project/build.scala