Fix give-brownie-points/about API DB queries

This should speed up these api calls significantly

server/component-passport.js

@@ -1,3 +1,4 @@
+import { Observable } from 'rx';
 import passport from 'passport';
 import { PassportConfigurator } from 'loopback-component-passport';
 import passportProviders from './passport-providers';
@@ -70,22 +71,21 @@ PassportConfigurator.prototype.init = function passportInit(noSession) {
   });
 
   passport.deserializeUser((id, done) => {
-
-    this.userModel.findById(id, { fields }, (err, user) => {
-      if (err || !user) {
-        return done(err, user);
+    Observable.combineLatest(
+      this.userModel.findById$(id, { fields }),
+      this.userModel.getPointsById$(id),
+      (user, points) => {
+        if (user) { user.points = points; }
+        return user;
       }
-      return this.app.dataSources.db.connector
-        .collection('user')
-        .aggregate([
-          { $match: { _id: user.id } },
-          { $project: { points: { $size: '$progressTimestamps' } } }
-        ], function(err, [{ points = 1 } = {}]) {
-          if (err) { return done(err); }
-          user.points = points;
-          return done(null, user);
-        });
-    });
+    )
+      .doOnNext(user => {
+        if (!user) { throw new Error('deserialize found no user'); }
+      })
+      .subscribe(
+        user => done(null, user),
+        done
+      );
   });
 };