Redirect to `/educators/classes` if a confirmed teacher

Fixes #757. Note: Because we are getting this info from the session, the redirect may not happen until the page is rendered first in cases where the connection is slow, or the db is slow.

src/components/registration/steps.jsx

@@ -762,9 +762,16 @@ module.exports = {
         getDefaultProps: function () {
             return {
                 email: null,
-                invited: false
+                invited: false,
+                confirmed: false,
+                educator: true
             };
         },
+        componentWillReceiveProps: function (nextProps) {
+            if (nextProps.educator && nextProps.confirmed) {
+                window.location.href = '/educators/classes/';
+            }
+        },
         render: function () {
             return (
                 <Slide className="registration-step last-step">