Catching and displaying more error on SparkSql
Make SparkInterpreter and SparkSqlInterpreter uses the same scheduler instance
Handling null, empty line interpret
Merge pull request #103 from NFLabs/catching_more_error_on_sparksql

Catching and displaying more error on SparkSql
Merge pull request #104 from NFLabs/scheduler_refactoring

Run sequentially all Spark/SparkSql paragraph when 'Run' button pressed
Merge branch 'master' into zcontext

Conflicts:
	spark/src/main/java/com/nflabs/zeppelin/spark/SparkSqlInterpreter.java