Updated sbt-extras & set javacOptions to target 1.5

Sorry for the noise - my editor eats whitespace.

Main differences are:

1) updated sbt and the build.properties to reflect that.
2) Added javacOptions in the basesettings: https://github.com/rozza/mongo-hadoop/blob/java1.5/project/MongoHadoopBuild.scala#L98-L99