Allow create Result object manually
Add performance test
Performance optimize. reuse ruby script engine instance
Merge pull request #37 from NFLabs/test/performance

Performance improvement
Simplify driver url. Remove z dependnecy in logical plan generation
Auto discovery zeppelin driver
Fix connection closing behavior
Add init() in ZeppelinDriver
Remove unused params from ZeppelinDriverFactory
Remove ZeppelinConfiguration param from MockDriverFactory
refactor package name from com.nflabs.zeppelin.zengine.api -> com.nflabs.zeppelin.zengine.stmt
and place only statements related class.
Wait until zeppelin server is actually up
Apply simplied driver url in configuration template
Remove hadoop dependency from zengine
Disable and change text right after run button clicked.
httpclient dependency as test scope
Set driver path by default
Don't truncate by comma when getting string value from xml
Removed unused method
Handle NPE