Release version 1.7.0

This update primarily improves testing framework, switches to the latest Hortonworks release, and uses Java 7.

• Use Java 7 by default ( Issue: #108 COOK-5 )
• Use HDP 2.1 by default ( Issue: #109 )
• Update tests ( Issues: #110 #111 #114 #115 #116 )
• Symlink default log dirs to new locations ( Issue: #113 )