Release version 1.8.0

This release adds support for the Avro and Parquet libraries/tools. It also adds support for Spark.

• Opportunistic creation of hive.exec.local.scratchdir ( Issue: #117 )
• Only use hadoop::repo for Hive ( Issue: #120 )
• More Oozie tests ( Issue: #121 )
• Only test hadoop::default in Vagrant ( Issue: #122 )
• Avro libraries/tools support ( Issue: #123 COOK-6 )
• Parquet support ( Issue: #124 COOK-7 )
• Improve version matching for HDP 2.1 ( Issue: #125 )
• Initial Spark support ( Issue: #126 )