Updated app requirements & Added some friendlier errors

 <?php namespace BookStack\Exceptions;
 
 
-class ConfirmationEmailException extends NotifyException
-{
-
-}
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+class ConfirmationEmailException extends NotifyException {}
\ No newline at end of file

@@ -5,6 +5,7 @@ namespace BookStack\Exceptions;
 use Exception;
 use Illuminate\Contracts\Validation\ValidationException;
 use Illuminate\Database\Eloquent\ModelNotFoundException;
+use PhpSpec\Exception\Example\ErrorException;
 use Symfony\Component\HttpKernel\Exception\HttpException;
 use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
 use Illuminate\Auth\Access\AuthorizationException;
@@ -38,17 +39,26 @@ class Handler extends ExceptionHandler
     /**
      * Render an exception into an HTTP response.
      *
-     * @param  \Illuminate\Http\Request  $request
-     * @param  \Exception  $e
+     * @param  \Illuminate\Http\Request $request
+     * @param  \Exception $e
      * @return \Illuminate\Http\Response
      */
     public function render($request, Exception $e)
     {
-        if($e instanceof NotifyException) {
+        // Handle notify exceptions which will redirect to the
+        // specified location then show a notification message.
+        if ($e instanceof NotifyException) {
             \Session::flash('error', $e->message);
             return response()->redirectTo($e->redirectLocation);
         }
 
+        // Handle pretty exceptions which will show a friendly application-fitting page
+        // Which will include the basic message to point the user roughly to the cause.
+        if (($e instanceof PrettyException || $e->getPrevious() instanceof PrettyException)  && !config('app.debug')) {
+            $message = ($e instanceof PrettyException) ? $e->getMessage() : $e->getPrevious()->getMessage();
+            return response()->view('errors/500', ['message' => $message], 500);
+        }
+
         return parent::render($request, $e);
     }
 }

 <?php namespace BookStack\Exceptions;
 
-
-use Exception;
-
-class ImageUploadException extends Exception {}
\ No newline at end of file
+class ImageUploadException extends PrettyException {}
\ No newline at end of file

 <?php namespace BookStack\Exceptions;
 
-
-use Exception;
-
-class LdapException extends Exception
-{
-
-}
\ No newline at end of file
+class LdapException extends PrettyException {}
\ No newline at end of file

+<?php namespace BookStack\Exceptions;
+
+use Exception;
+
+class PrettyException extends Exception {}
\ No newline at end of file

 <?php namespace BookStack\Exceptions;
 
 
-class SocialDriverNotConfigured extends \Exception
-{
-}
\ No newline at end of file
+class SocialDriverNotConfigured extends PrettyException {}
\ No newline at end of file

 <?php namespace BookStack\Exceptions;
 
 
-class SocialSignInException extends NotifyException
-{
-
-}
\ No newline at end of file
+class SocialSignInException extends NotifyException {}
\ No newline at end of file

 <?php namespace BookStack\Exceptions;
 
 
-class UserRegistrationException extends NotifyException
-{
-
-}
\ No newline at end of file
+class UserRegistrationException extends NotifyException {}
\ No newline at end of file

@@ -4,6 +4,7 @@ use BookStack\Exceptions\ImageUploadException;
 use BookStack\Image;
 use BookStack\User;
 use Exception;
+use Intervention\Image\Exception\NotSupportedException;
 use Intervention\Image\ImageManager;
 use Illuminate\Contracts\Filesystem\Factory as FileSystem;
 use Illuminate\Contracts\Filesystem\Filesystem as FileSystemInstance;
@@ -119,10 +120,12 @@ class ImageService
      * Checks the cache then storage to avoid creating / accessing the filesystem on every check.
      *
      * @param Image $image
-     * @param int   $width
-     * @param int   $height
-     * @param bool  $keepRatio
+     * @param int $width
+     * @param int $height
+     * @param bool $keepRatio
      * @return string
+     * @throws Exception
+     * @throws ImageUploadException
      */
     public function getThumbnail(Image $image, $width = 220, $height = 220, $keepRatio = false)
     {
@@ -139,8 +142,16 @@ class ImageService
             return $this->getPublicUrl($thumbFilePath);
         }
 
-        // Otherwise create the thumbnail
-        $thumb = $this->imageTool->make($storage->get($image->path));
+        try {
+            $thumb = $this->imageTool->make($storage->get($image->path));
+        } catch (Exception $e) {
+            if ($e instanceof \ErrorException || $e instanceof NotSupportedException) {
+                throw new ImageUploadException('The server cannot create thumbnails. Please check you have the GD PHP extension installed.');
+            } else {
+                throw $e;
+            }
+        }
+
         if ($keepRatio) {
             $thumb->resize($width, null, function ($constraint) {
                 $constraint->aspectRatio();

@@ -17,19 +17,13 @@ A platform to create documentation/wiki content. General information about BookS
 
 ## Requirements
 
-BookStack has similar requirements to Laravel. On top of those are some front-end build tools which are only required when developing.
+BookStack has similar requirements to Laravel:
 
 * PHP >= 5.5.9, Will need to be usable from the command line.
-* OpenSSL PHP Extension
-* PDO PHP Extension
-* MBstring PHP Extension
-* Tokenizer PHP Extension
+* PHP Extensions: `OpenSSL`, `PDO`, `MBstring`, `Tokenizer`, `GD`
 * MySQL >= 5.6
 * Git (Not strictly required but helps manage updates)
 * [Composer](https://getcomposer.org/)
-* [Node.js](https://nodejs.org/en/) **Development Only**
-* [Gulp](http://gulpjs.com/) **Development Only**
-
 
 ## Installation
 
@@ -144,7 +138,14 @@ A user in BookStack will be linked to a LDAP user via a 'uid'. If a LDAP user ui
 
 You may find that you cannot log in with your initial Admin account after changing the `AUTH_METHOD` to `ldap`. To get around this set the `AUTH_METHOD` to `standard`, login with your admin account then change it back to `ldap`. You get then edit your profile and add your LDAP uid under the 'External Authentication ID' field. You will then be able to login in with that ID.
 
-## Testing
+## Development & Testing
+
+All development on BookStack is currently done on the master branch. When it's time for a release the master branch is merged into release with built & minified CSS & JS then tagged at it's version. Here are the current development requirements:
+
+* [Node.js](https://nodejs.org/en/) **Development Only**
+* [Gulp](http://gulpjs.com/) **Development Only**
+
+SASS is used to help the CSS development and the JavaScript is run through browserify/babel to allow for writing ES6 code. Both of these are done using gulp.
 
 BookStack has many integration tests that use Laravel's built-in testing capabilities which makes use of PHPUnit. To use you will need PHPUnit installed and accessible via command line. There is a `mysql_testing` database defined within the app config which is what is used by PHPUnit. This database is set with the following database name, user name and password defined as `bookstack-test`. You will have to create that database and credentials before testing.
 

+@extends('base')
+
+@section('content')
+
+
+    <div class="container">
+        <h1 class="text-muted">An Error Occurred</h1>
+        <p>{{ $message }}</p>
+    </div>
+
+@stop
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