no cache for chrome
Set default spark version to 1.1.1
Bring some profile from spark for build against MapR and Provided Hadoop
Merge pull request #231 from NFLabs/spark_1.1.1

Set default spark version to 1.1.1
Add test coverage plugin
update contributing note about location of test coverage
Merge pull request #237 from NFLabs/feature/cobertura

Add test coverage plugin