Give more specific reason for failed login

src/components/login_form/login_form.js

@@ -10,8 +10,8 @@ const LoginForm = {
     submit () {
       this.$store.dispatch('loginUser', this.user).then(
         () => { this.$router.push('/main/friends')}, 
-        () => {
-          this.authError = true
+        (error) => {
+          this.authError = error
           this.user.username = ''
           this.user.password = ''
         }

src/components/login_form/login_form.vue

@@ -18,7 +18,7 @@
           <button :disabled="loggingIn" type='submit' class='btn btn-default base05 base01-background'>Submit</button>
         </div>
         <div v-if="authError" class='form-group'>
-          <button disabled='true' class='btn btn-default base05 error'>Error logging in, try again</button>
+          <button disabled='true' class='btn btn-default base05 error'>{{authError}}</button>
         </div>
       </form>
     </div>