Add New Recovery Method dialog

Adds a New Recovery Method dialog which is shown when key backup fails because
of a version mismatch / version not found error.

The set up button in the dialog currently only marks a device as verified (via a
verification prompt) instead of the eventual restore and cross-sign flow, since
those pieces don't exist yet.

Signed-off-by: J. Ryan Stinnett <jryans@gmail.com>

src/components/views/dialogs/BaseDialog.js

@@ -57,8 +57,7 @@ export default React.createClass({
         className: PropTypes.string,
 
         // Title for the dialog.
-        // (could probably actually be something more complicated than a string if desired)
-        title: PropTypes.string.isRequired,
+        title: PropTypes.node.isRequired,
 
         // children should be the content of the dialog
         children: PropTypes.node,