Setting hive artifacts groupId to edu.berkeley.cs.shark, so it can be published to maven.cetral

    For more information see https://issues.sonatype.org/browse/OSSRH-7151
Merge pull request #29 from c0s/ebcs-shark-0.9

Setting hive artifacts groupId to edu.berkeley.cs.shark, so it can be pu...
Check for null in Hive History
Fixed bug in location of check for null query info
Merge pull request #30 from kayousterhout/shark-0.9

Check for null in Hive History
Fix bug in hive with 24 hour timestamp.

This is a backport of:
https://issues.apache.org/jira/browse/HIVE-3850
Using correct classifiers for hive-exec test artifacts.

Hive-proper tries to distinguish artifacts by using different names, and
keeping artifactId the same. Which would never work of course. The correct way
is to use classifiers.