add new JavaConversions and MutableDataStructure WartTraversers
- JavaConversions: disabling scala.collection.JavaConversions
- MutableDataStructure: disabling scala.collection.mutable._
Cross-build to 2.11.0-RC3, cleaner build.sbt
Setting version to 0.8
Setting version to 0.9-SNAPSHOT
Update version in README
Merge pull request #66 from pk11/mutable-javaconversions-rules

add new JavaConversions and MutableDataStructure WartTraversers
Let the user choose warnings over errors on per-traverser basis
Merge pull request #68 from michalrus/only-warn-traverser

Let the user choose warnings over errors on per-traverser basis