Added simple sbt build file for publishing.

The Maven build does not contain the Scala version number
in the artifact name. This causes problems when publishing
to Sonatype.
Added an "Add Method" refactoring
Merge pull request #14 from dnadolny/new-method

Added an "Add Method" refactoring
Fix compilation on Scala 2.11

Apparently there's now also a NameTree in the Scala compiler
which can lead to conflicts with our own NameTree.