Marcus - Updated to include headers

api.jsx

// Only part of file
return fetch(url, {
  method: 'post',
  headers: {
    'Accept': 'application/json',
    'Content-Type': 'application/json',
    'Auth': localStorage.getItem('token')
  },
  body: JSON.stringify({
    email: userEmail,
    password: userPassword,
  })
}).then(function(response) {
  return response.json().then(function(data) {
    return {
      response: response,
      data: data
    };
  })
})

user-store.jsx

// Entire file
var Api = require('../utils/api');
var Reflux = require('reflux');
var Actions = require('../actions');

module.exports = Reflux.createStore({
	listenables: [Actions],
	createUser: function(url, userEmail, userPassword) {
		Api.postUser(url, userEmail, userPassword).then(function(res) {
			return alert("User Created!" + res.data);
		}, function() {
			return alert("Error creating user");
		});
	},
	loginUser: function(url, userEmail, userPassword) {
		Api.postUser(url, userEmail, userPassword).then(function(res) {
			var token = res.response.headers.get('Auth')
			localStorage.setItem('token', token);
			return alert("User logged in!" + res.data);
		}, function() {
			return alert("Cannot login in user");
		});
	},
	triggerChange: function() {

		this.trigger('change', this.newUser);

	}
});