Remove withSources from dependencies.

They cause invalid dependencies to be added to the pom file uploaded to mvn central, see https://github.com/sbt/sbt/issues/1025 for details
Setting version to 1.2
Setting version to 1.3-SNAPSHOT
Setting version to 1.2
Setting version to 1.3-SNAPSHOT
Setting version to 1.2
Setting version to 1.3-SNAPSHOT
Setting version to 1.2
Setting version to 1.3-SNAPSHOT
Merge pull request #5 from thetrav/master

Maven central release changes