Updated ModelToIdPropertyTransformer so it works with Entities which implement \ArrayAccess
Added FooArrayAccess class to allow testing of new code
See #2301
Fixed code value in sonata_type_model_autocomplete_widget so it works with embedded admins
Fixed $property name in HelperController::retrieveAutocompleteItemsAction() (was $prop)
- minor change to exception message so apostrophe is not needed
- removed unused Controller reference from top of HelperController
Updated logic and added Exception messages when an incorrect configuration is used.
Update recipe_file_uploads.rst

We have to change field name from 'file' into 'filename' while we need field 'file' to be not mapped. Field 'file' is only temporary to store UploadedFile instance.
Merge pull request #2318 from trujamii/patch-1

Update recipe_file_uploads.rst
improve Catalan translation
Fixed some spanish translations.

- Fixed some typos and grammatical errors.
- Translated 'Dashboard' as 'Escritorio' just like Wordpress (Spanish translation) does.
- Translated 'link_actions' as 'Acciones'.
Merge pull request #2322 from sgomez/patch-1

Fixed some spanish translations.
Updated ModelAutocompleteType::buildForm() to use any attr options set for this widget
Removed span5 default class from attr option and updated tests
Use sonata_admin.admin.uniqid instead of sonata_admin.admin.root.uniqid
Fixed issue when multiple sub-admins were added in form building
Added test
Merge pull request #2303 from caponica/autocomplete_embed_fix

Fix to enable autocomplete in embedded Admins
Remove box shadow

![remove box shadow at sonata collection delete button](http://i5.minus.com/jb1vODTaDGKiPT.jpg)
Remove box shadow at sonata collection delete button
Merge pull request #2325 from Bladrak/fix_multiple_subforms

Fixed issue when multiple sub-admins were added in form building
Merge pull request #2327 from spolischook/patch-3

Remove box shadow
Fixed collections delete/add button styles
Merge pull request #2328 from spolischook/patch-4

Fixed collections delete/add button styles
Updates preview documentation

Changes:
- New accept/reject button design with glyphicons
- css that actually hides the form (fieldsets are no longer used)
Merge pull request #2329 from Green-Cat/patch-1

Updates preview documentation