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/UserDetail.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Http\Controllers\Admin;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests;
+
+class UserDetail extends Controller
+{
+}