Fix safe_label option in menu template.

Original knp_menu label allows unescaped html. Sylius override lost this ability, this commit restores it.
Merge pull request #334 from Richtermeister/fix-menu-template

Fix safe_label option in menu template.
Merge pull request #329 from Richtermeister/fix-taxonomy-cascade-remove

Cascade Delete for Taxonomy and Options
Fix for issue with order processing when given value is not array or Doctrine Collection
Merge pull request #342 from stloyd/bugfix/issue_317

Fix for issue with order processing when given value is not array or Doctrine Collection
Fix Image placeholders

 - avoid usage of placehold.it images together with image filter,
   because image filter does not (currently) work with remote URLs.
 - ensure placeholders have proper size.
 - add missing alt tag content on images.
Merge pull request #344 from Richtermeister/fix-image-placeholders

Fix Image placeholders
Merge pull request #331 from edwines/ancestor

Update the ancestorClass in the backend menu
Merge pull request #319 from jjanvier/fix/account-menu

Enhance main app menus to make them more consistent
Fix for doctrine mappings issues in ShippingBundle.
Fixed: checkout security return binded form
Add backend form error messages

Currently global form errors (extra fields, csrf, etc) are not displayed in backend.
This commit adds one to discuss if this is the desired approach. (will do all if OK).
Merge pull request #345 from antonioperic/fixing-checkout

Returning form with informations to view - fixed
Fix Shipping Method Calculator form prototype handling

Currently, switching the calculator field in the ShippingMethodType embeds calculator config prototypes under __name__ key, which causes the form to not validate. This commit makes the following changes:
 * use the proper field name (configuration)
 * skip embedding forms for calculators that don't support configuration (currently results in empty text field being embedded)
Fix translation & make it more consistent

Carts should be singular, and wording is now more consistent throughout site.
Merge pull request #1 from Sylius/master

Merge with current version
gitignore
Move purger service from Sales to Cart bundle
Simplify namespace
Use Datetime namespace