Make scala 2.10.6 default (over 2.11.8)
Make scala 2.10.6 default (over 2.11.8)

maasg/spark-notebook,andypetrella/spark-notebook,maasg/spark-notebook,andypetrella/spark-notebook,maasg/spark-notebook,spark-notebook/spark-notebook,andypetrella/spark-notebook,spark-notebook/spark-notebook,spark-notebook/spark-notebook,maasg/spark-notebook,andypetrella/spark-notebook,spark-notebook/spark-notebook