Reverting change to Wat model which made user field nullable

Author: Matthew Hilton

data/config.js

@@ -18,7 +18,7 @@ Answer = new Schema({
   });
 
 Wat = mongoose.model('Wat', new Schema({
-    _user: { type: ObjectId, ref: 'User', required: false }
+    _user: { type: ObjectId, ref: 'User', required: true }
   , phrase: { type: String, trim: true, required: true, index: true }
   , posted: { type: Date, default: Date.now }
   , region: String