CDK-515: Added tests for Spark jobs reading from/writing to Datasets.

 * Added spark-core_2.10 under dependency management
 * Implemented tests that use FileSystemDataset and HBaseDataset
I've been waiting for one of those to sneak through. My IDE autofills the license, but our poms don't have an organization block, so it defaults to my user name:

<organization>
  <name>Cloudera, Inc</name>
</organization>

Any issue with me adding that to the kite parent pom?