add user signup through loopback

common/models/User.js

@@ -1,19 +0,0 @@
-var debug = require('debug')('freecc:models:user');
-
-module.exports = function(User) {
-  debug('setting up user hooks');
-  /*
-   * NOTE(berks): not sure if this is still needed
-  User.observe('before save', function setUsername(ctx, next) {
-    // set username from twitter
-    if (ctx.instance.username && ctx.instance.username.match(/twitter/g)) {
-      ctx.instance.username =
-        ctx.instance.username.match(/twitter/g) ?
-          ctx.instance.username.split('.').pop().toLowerCase() :
-          ctx.instance.username;
-      debug('username set', ctx.instance.username);
-    }
-    next();
-  });
-  */
-};

common/models/user.json

@@ -3,6 +3,7 @@
   "base": "User",
   "trackChanges": false,
   "idInjection": true,
+  "strict": true,
   "properties": {
     "email": {
       "type": "string",