title: Can't upload some filetypes
body: <p>I'm using Laravel 5.1.<br>
  Uploading of filetypes jpeg, gif, png is working, but pdf, doc, docx, txt filetypes are not working.  </p>
  
  <p>Here is my view</p>
  
  <pre><code>{!! Form::label('department','Department', ['class'=&gt;'col-sm-2 control-label'] ) !!}
  &lt;div class="col-sm-10"&gt;
      {!! Form::select('department', $departmentList, null, ['class'=&gt;'form-control']) !!}
  
      &lt;span style="color: red"&gt;{{ $errors-&gt;first('department') }}&lt;/span&gt;
  &lt;/div&gt;
  &lt;div class="form-group"&gt;
  
      {!! Form::label('document','Chose a file or Document', ['class'=&gt;'col-sm-2 control-label'] ) !!}
  
      &lt;div class="col-sm-10"&gt;
  
          {!! Form::file('file', null, ['class'=&gt;'form-control']) !!}
          &lt;p class="help-block"&gt;Upload your document in pdf, doc. jpg, png, tif, gif&lt;/p&gt;
          &lt;span style="color: red"&gt; {{ $errors-&gt;first('file') }}&lt;/span&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  {!! Form::close() !}}
  </code></pre>
  
  <p><strong>my FormRequest</strong></p>
  
  <pre><code>public function rules()
  {
      return [
          'user_id'=&gt;'integer',
  
          'department'=&gt;'required',
          'file'=&gt;'required|mimes:application/msword, application/vnd.openxmlformats-officedocument.wordprocessingml.document, application/pdf, jpeg, png, gif'
      ];
  }
  </code></pre>
  
  <p>}</p>
  
  <p><strong>and my controller</strong></p>
  
  <pre><code>public function update($id, RepositoryRequest $request)
      {
      $repository = Repository::findOrFail($id);
     $repository-&gt;department = $request-&gt;input('department');
  
  
  
      $file = \Input::file('file');
      $filename = date('Y-m-d-H:i:s').'-'.$file-&gt;getClientOriginalName();
  
      $path =public_path('/img/repository/').$filename ;
      \Image::make($file-&gt;getRealPath())-&gt;resize(468, 249)-&gt;save($path);
  
      $repository-&gt;file = 'img/repository/'.$filename;
  
      $repository-&gt;save();
  
      return redirect('/')-&gt;with('flash_message', 'You have successfully updated the repository');
  </code></pre>
  
  <p>This is the error:  </p>
  
  <blockquote>
    <p>NotReadableException in Decoder.php line 21: Unable to read image from
    file (/tmp/phpdNQvEG).</p>
  </blockquote>