Patches to run against DSE Spark
Updates to better fit with DSE Integration

Read dse path from env DSE_HOME
Removed Reliance on Cassandra Context Jar
Add spark context shutdown to Testrunner
Config determines sparkmaster from dsetool
Bin/Run passes compiled jar to DSE generated Classpath
Removed Cluster Management Code from bin/run
Added Helper Scripts for Setting up DSE Cluster
Cleaning Up Directory, Adding Git Ignore and Config
Added Modified databrix spark-perf suite