examples: add missing swing dependency

[bardurdam]

• move scala code in examples project under examples/src/main/scala/*
  in order for sbt to include it when compiling project.
• add scala swing dependency that was missing when upgrading to scala
  2.11 due to example project not being compiled in sbt.

[norbert-radyk]

Thanks a lot, for upgrading this and apologies for the delay in the merge. I am going to merge the change, however still not 100% in my mind if keeping the code to show dialog about where to save generated report adds much value. Since does not illustrate how Spoiwo works I might remove it together with the library reference in the future. On the other side moving the examples so they are compiled every time is a good and welcome change.