Remove spark 1.4 from travis
Remove spark 1.4 from travis

maasg/spark-notebook,spark-notebook/spark-notebook,maasg/spark-notebook,maasg/spark-notebook,andypetrella/spark-notebook,maasg/spark-notebook,antonkulaga/spark-notebook,spark-notebook/spark-notebook,0asa/spark-notebook,andypetrella/spark-notebook,antonkulaga/spark-notebook,0asa/spark-notebook,0asa/spark-notebook,0asa/spark-notebook,andypetrella/spark-notebook,spark-notebook/spark-notebook,antonkulaga/spark-notebook,antonkulaga/spark-notebook,spark-notebook/spark-notebook,andypetrella/spark-notebook