Installing and managing modules from admin panel (#847)

resources/views/system/installer/errors/already-installed.blade.php

@@ -0,0 +1,11 @@
+@extends('system.installer.app')
+
+@section('content')
+  <h2>phpVMS already installed!</h2>
+  <p>phpVMS has already been installed! Please remove the modules/Installer folder.</p>
+  {{ Form::open(['url' => '/', 'method' => 'get']) }}
+  <p style="text-align: right">
+    {{ Form::submit('Go to your site >>', ['class' => 'btn btn-success']) }}
+  </p>
+  {{ Form::close() }}
+@endsection