Show warning alerts at frontend
Multiple object managers support
minor touches
Fix random CS issues in code & phpdocs
remove unused use statement
[Order] Introduce immutable order items
Add ability to lock order adjustments.
[AddressingBundle] Allow to easier replace default zone types
[WebBundle] Product without variants should show its price
[ci skip]
Merge pull request #1957 from stloyd/feature/custom_zone_types

[AddressingBundle] Allow to easier replace default zone types
Merge pull request #1958 from stloyd/bugfix/product_without_variants

[WebBundle] Product without variants should show its price
Merge pull request #1948 from stloyd/feature/immutable_order_item

[Order] Introduce immutable order items
Merge pull request #1952 from stloyd/bugfix/cs_fixes

Fix random CS issues in code & phpdocs
[ContentBundle,WebBundle] Improve ContentBundle to use the power of
Symfony-CMF

Added possibility to add from backend :
- menus, 
- slideshow (with liipImagine filter), 
- routes to static content,

Added 3 slideshow location in layout. Display slideshow in top, content
and sidebar positions with sonata_block_render.

Menus could be displayed in frontend by simply calling knp_menu_render
and menu name (eg: {{ knp_menu_render('main') }})

Fixed some typos from previous ContentBundle commit, and create all
translations strings

Reorganize route and template by grouping them in a content dir for
better future maintenance
[ContentBundle] Fix wrong prefix
Merge pull request #1963 from stloyd/patch-2

[ContentBundle] Fix wrong prefix
Fix composer.json files + CHANGELOGs
[ContentBundle,WebBundle] Fix some standard coding for PR 1962
[ContentBundle,WebBundle] Fix some bad coding practices while displaying
collection for slideshow and menu
[Core] Optimize NthOrder promotion checker.