Fix for ScanTest to run it against hadoop 2.0.

Without secondary sort, there is no guaranteed order of grouped touples. This change makes it deterministic.
Build changes that enable scalding on hadoop 2.0.
Revert "Build changes that enable scalding on hadoop 2.0."

This reverts commit 4bea612061933c2fa8b74f78f9034bcbe0c8eb86.
Merge pull request #361 from sjlee/sjlee_hadoop_2.0

Fix for ScanTest to run it against hadoop 2.0.