nullify jettyServer on stop() so that shared test base-classes with @BeforeClass DropWizardAppRules can start new jetty servers
Merge pull request #635 from ellispritchard/master

nullify jettyServer on stop()
Stored ViewRenderer instances resulted from jersey ServiceFinder

ServiceFinder iterator always creates a new instance when iterating
through viewRenderers, causing the renderer must be reconfigured
every time the view is requested.
Merge pull request #607 from vietnq/fix_view_renderers

Fix view renderers are recreated in every request