Twitter oauth login failing: fix for javascript error

Twitter login is currently failing because of html-escaping in the twitter/complete view; simple fix to mark data as `html_safe`.

![twitter oauth](https://www.evernote.com/shard/s111/sh/c5dafd76-4fe2-4f94-996c-1acaa8b1b643/2951c83b6c375a4b3cde9b3c272250bf/res/c38d2cde-dce0-4111-915a-9da5a785903b/skitch.png?resizeSmall&width=832)