// User Registration Route - http://localhost:8080/api/users
        router.post('/users', function(req, res) {
        var user = new User();
        user.username = req.body.username;
        user.password = req.body.password;
        user.email = req.body.email;

        if (req.body.username == null || req.body.username == '' || req.body.password == null || req.body.password == '' || req.body.email == null || req.body.email == '') {

            res.json({success: false, message: 'Ensure username, email and password were provided.'});

        } else {
            user.save(function(err) {
                if(err){
                    res.json({ success: false, message: 'Username or Email already exists.'});
                } else {
                    res.json({ success: true, message: 'User Created.'});
                }
            });
        }
    });