Changed play-scala-intro Scala version to 2.10.4

The DB framework sorm is only working with Scala 2.10.4. Therefor the Scala version in the build.sbt is explicitly set to 2.10.4.

Signed-off-by: Markus Jura <markus.jura@gmail.com>
Merge pull request #3211 from markusjura/master

Changed play-scala-intro Scala version to 2.10.4