v0.1.11

"In silico"

Notable changes:

• bump Dataflow Java SDK to 1.6.1 #209
• refactor subtractByKey and intersectByKey #206
• refactor HDFS #212
• fix ObjectFileIO in test #211
• allow usage of different ScalaTest specs #208
• bump ScalaTest and ScalaCheck versions
• various JobTest fixes and enhancements