when creating a run, associate it with a user

controllers/runs.js

@@ -1,5 +1,6 @@
 var controller = require('express').Router();
 var bodyParser = require('body-parser');
+var Users = require('../models/users.js');
 var Runs = require('../models/run.js');
 
 controller.use(bodyParser.json());
@@ -11,10 +12,14 @@ controller.get('/', function(req, res){
 });
 
 controller.post('/', function(req, res){
+	Users.findById(req.session.currentUser.id).then(function(user){
 		Runs.create(req.body).then(function(createdRun){
+			user.addRun(createdRun).then(function(){
 				res.json(createdRun);
+			});
 		});;
 	});
+});
 
 controller.delete('/:id', function(req, res){
 	Runs.destroy({