Fix HiveConf serialization.

Conflicts:
	src/main/scala/shark/execution/serialization/XmlSerializer.scala
Fix copyright.
Downgraded hadoop version in CI script to 1.0.4.
Added a dependency on commons-io 2.1 to fix the Hive unit tests.
Added dependency on commons-io and commons-httpclient for the unit tests to pass.
Consistent naming for storage levels

Is there any reason for not making the string names consistent?
Merge pull request #135 from amirshim/patch-1

Consistent naming for storage levels
Merge pull request #131 from jhartlaub/bugfix

Bug fix for HiveConf serialization - HiveConf is not a javabean, XMLEncoder does not work on it.
Minor style cleanup for HiveConfPersistenceDelegate.
Merge branch 'master' of https://github.com/amplab/shark into 0.8-merge