remove travis configuration (#859)
remove travis configuration (#859)


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