WIP migrating out weighted ALS
MAHOUT-1363:  rebasing scala DSL packages to contain org.apache prefix

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1545400 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' into dev-0.9.x-scala
WIP on weighted ALS port, DRM support