Installer updates

Added probe.php
Added new installer views and controllers
Updated AuthController
Updated Middlewares
Updated Commands for installation process

app/Http/Middleware/IsInstalled.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+
+class IsInstalled
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param \Illuminate\Http\Request $request
+     * @param \Closure                 $next
+     *
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        if (!isInstall()) {
+            return $next($request);
+        } else {
+            if ($request->isJson()) {
+                $url = url('/');
+                $result = ['fails' => 'already installed', 'api' => $url];
+
+                return response()->json(compact('result'));
+            } else {
+                return redirect('/');
+            }
+        }
+    }
+}