Merge pull request apache#163 from yangzhiyue/master

close apache#162, I contributed the bml-engine-hook

Merge pull request apache#58 from chaogefeng/master

Added JDBC engine support and updated JDBC installation scripts

Fix the NullPointerException caused by the resultSet is path

update install.sh

delete useless code in SparkEngineExecutor

update install.sh to solve jar conflicts