Laravel 5.3 upgrade (#189)

* Started move to laravel 5.3

* Started updating login & registration flows for laravel 5.3 update

* Updated app emails to notification system

* Fixed registations bugs and removed email confirmation model

* Fixed large portion of laravel post-upgrade issues

* Fixed and tested LDAP process

app/Notifications/ResetPassword.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace BookStack\Notifications;
+
+use Illuminate\Notifications\Notification;
+use Illuminate\Notifications\Messages\MailMessage;
+
+class ResetPassword extends Notification
+{
+    /**
+     * The password reset token.
+     *
+     * @var string
+     */
+    public $token;
+
+    /**
+     * Create a notification instance.
+     *
+     * @param  string  $token
+     */
+    public function __construct($token)
+    {
+        $this->token = $token;
+    }
+
+    /**
+     * Get the notification's channels.
+     *
+     * @param  mixed  $notifiable
+     * @return array|string
+     */
+    public function via($notifiable)
+    {
+        return ['mail'];
+    }
+
+    /**
+     * Build the mail representation of the notification.
+     *
+     * @return \Illuminate\Notifications\Messages\MailMessage
+     */
+    public function toMail()
+    {
+        return (new MailMessage)
+            ->line('You are receiving this email because we received a password reset request for your account.')
+            ->action('Reset Password', baseUrl('password/reset/' . $this->token))
+            ->line('If you did not request a password reset, no further action is required.');
+    }
+}