Merge pull request #4 from hiroyuki-sato/hiroysato

Add Listener objects GraphVisualizer, TableVisualizer and SummaryReport. Looks good, thans for the effort.
Version bump for listeners
Added support for basic query params
Version bump
Allow specification of region in api call
Version bump
added header to DSL
uri decode and encode url string
Add view results visualizer
Bug fix
Add LDAPExtSampler