fix #2163 add stats.maxMP in GET /api/v2/user. @russtaylor let me know

if you need it in other locations

src/controllers/user.js

@@ -144,6 +144,7 @@ api.getUser = function(req, res, next) {
   var user = res.locals.user.toJSON();
   user.stats.toNextLevel = shared.tnl(user.stats.lvl);
   user.stats.maxHealth = 50;
+  user.stats.maxMP = res.locals.user._statsComputed.maxMP;
   delete user.apiToken;
   if (user.auth) {
     delete user.auth.hashed_password;