adding optional jsonp parameter to events/get_data
adding optional jsonp parameter to events/get_data

* using the same code / structure as `render`

Krylon360/evernote-graphite-web,Krylon360/evernote-graphite-web,Talkdesk/graphite-web,Krylon360/evernote-graphite-web,Krylon360/evernote-graphite-web,evernote/graphite-web,evernote/graphite-web,Talkdesk/graphite-web,Talkdesk/graphite-web,evernote/graphite-web,Krylon360/evernote-graphite-web,Talkdesk/graphite-web,Talkdesk/graphite-web,Krylon360/evernote-graphite-web,evernote/graphite-web,Talkdesk/graphite-web,evernote/graphite-web