Remove staging repos for Hive and Spark, now that they're released
Merge pull request #321 from harveyfeng/branch-0.9

Remove staging repos for Hive and Spark, now that they're released
Bump up sbt version to 0.13 and remove SCALA_HOME

sbt jars are fetched if not found, similar to what Spark does
Merge pull request #322 from harveyfeng/branch-0.9

Bump up sbt version to 0.13 and remove SCALA_HOME
Fetch hadoop-test from HIVE_DEV_HOME for testing.

Avoids conflict when a custom Hadoop version is passed.
Make Spark version customizable, now that there's a cdh version.
Merge pull request #323 from harveyfeng/branch-0.9

Make SPARK_VERSION configurable and avoid fetching hadoop-test when it's not needed