sbt/sbt-protobuf — pull request #20 by fanatoly (2014-04-06 02:20:41+00:00)
Title: delete fix

I ran into issues with deleting schemas. If a schema file was removed, the corresponding java file was
not. Moreover, if all schema files were removed, protoc was invoked with no source files, causing a build error. Both of these conditions can lead to bad builds and require a clean build to resolve