add pull in user image on signup when available

server/boot/home.js

@@ -1,3 +1,5 @@
+var defaultProfileImage =
+  require('../../common/utils/constantStrings.json').defaultProfileImage;
 var message =
   'Learn to Code JavaScript and get a Coding Job by Helping Nonprofits';
 
@@ -9,8 +11,7 @@ module.exports = function(app) {
 
   function index(req, res, next) {
     if (req.user && !req.user.picture) {
-      req.user.picture =
-        'https://s3.amazonaws.com/freecodecamp/camper-image-placeholder.png';
+      req.user.picture = defaultProfileImage;
 
       req.user.save(function(err) {
         if (err) { return next(err); }