set scrollbar auto for iframe
ZEPPELIN-72 - Show horizontal scrollbar for visualization
Autoheight iframe based on content update.
Merge branch 'master' into auto_resize_iframe

Conflicts:
	zeppelin-web/app/controllers.js
	zeppelin-web/app/views.js
Merge branch 'master' into auto_resize_iframe
Merge branch 'master' into auto_resize_iframe
Merge pull request #15 from NFLabs/auto_resize_iframe

Show horizontal scrollbar and auto height based on iframe content