fix single upload when data is null
Merge pull request #55 from montabou/fix-single-upload

fix single upload when data is null
add order of registerBundles to make 'options' of HelpMessageExtension work

I had to put the form-extensions-bundle right before the admingeneratorgenerator-bundle to make the rendering of 'help' work with the twig function form_row (using HelpMessageExtension).

This took me round about 4 hours.
 
```php

        $bundles[] = new Avocode\FormExtensionsBundle\AvocodeFormExtensionsBundle();
        $bundles[] = new Admingenerator\GeneratorBundle\AdmingeneratorGeneratorBundle();
```

see also discussion in: https://github.com/avocode/FormExtensions/pull/9
Merge pull request #58 from robertfausk/patch-1

add order of registerBundles to make 'options' of HelpMessageExtension work
Update README.md

Fix issue #44
Add multiple = true

Fix for #59 and #15