Compiled with Scala 2.10

Hi, we need to use Scala 2.10 on our project and depend on fake-hbase.

This pull request contains a small number of changes:

 - a build.sbt file in order to avoid messing up with the pom infrastructure
 - a new case for the `Filter.ReturnCode.INCLUDE_AND_NEXT_COL` code which I hope is correct
 - 2 empty implementations

It was a bit hard for me to understand exactly which combinations of hbase and hadoop-common I was supposed to rely on, so please fix those dependencies if necessary.

Going forward, it would be really nice if you could provide a cross-scala build of fake-hbase or consider a Java rewriting because the Scala incompatibility makes it unusable for us.

Thank you very much.