Fix finding Spark UI when running on Mesos.

Spark UI is on localhost when spark.master is set to a mesos URL.
Change link for reporting issues
Merge pull request #19 from david-resnick/spark-ui-with-mesos

Fix finding Spark UI when running on Mesos.
fix parameter order
Merge pull request #21 from CurryGaifan/master

fix parameter order