REFACTORING: split UserManagement controller into more classes

One class for user management would be really messy. This commit splits it into more classes.

app/Http/Controllers/Admin/UsersOverview.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Http\Controllers\Admin;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests;
+use App\Http\Requests\CreateNewUserRequest;
+use App\Models\User;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Hash;
+
+class UsersOverview extends Controller {
+    public function getOverview() {
+        return view('admin.userManagement.overview');
+    }
+}