[FLINK-1225] Fix for quickstart packaging

Quick fix for the two issues I've found:
  1. The user code was filtered out, so I moved it into a namespace outside org.apache.flink.
  1. The build of our 0.8 and 0.7 versions do not really work together due to the hadoop profile changes, so I have decided to bump that version. This means that the scripts depending on the 0.8.0 version will only work after the release. The first rc is hopefully coming today.