title: spark driver not found
body: <p>I am trying to write dataframe to sqlserver using spark. I am using the method write for dataframewriter to write to sql server.
  Using DriverManager.getConnection I am able to get connection of sqlserver and able to write but when using jdbc method and passing uri I am getting "No suitable driver found".
  I have passed the jtds jar in the --jars in spark-shell. 
  Spark version : 1.4</p>