Fixed SBT version issue and updated to newest sbt-idea plugin

If interested, these are the needed (minor) changes to get the module to compile again. The code was correct but the SBT configuration was not.

I had to add a build.properties file to force SBT to use version 0.11.2 otherwise the dependencies wouldn't work. That however is a problem with the Eclipse plugin since the latest version only works with 0.11.3-2 or 0.12, and 0.12 is not available in binary format yet... So for now I removed the Eclipse plugin.

Hope these help.