scala 2.10 requires Java 1.6,
using Scala 2.10.3,
resolved maven-scala-plugin warning
fixed some warnings
Merge pull request #35 from MartinWeindel/scala-2.10

Fixing inconsistencies and warnings on Scala 2.10 branch

- scala 2.10 requires Java 1.6
- using newest Scala release: 2.10.3
- resolved maven-scala-plugin warning
- fixed various compiler warnings