Updating SF and its main bundles
Merge pull request #1130 from jjanvier/fix/update-sf

Updating Symfony to 2.3.11
changed deprecated FormException in favor of InvalidConfigurationException
only valid variants should be dispatched
Fixing CS, adding phpdoc
Merge pull request #1134 from akovalyov/fix/deprecated-exception

[VariableProductBundle]Changed deprecated FormException in favor of InvalidConfigurationException
made variant generator flash message translatable
Merge pull request #1136 from akovalyov/fix/generator-events-dispatching

[VariableProductBundle] Only valid variants should be dispatched
Merge pull request #1138 from akovalyov/fix/variant-generator-flash-translations

Variant generator flash message should be translatable
Merge pull request #1071 from aRn0D/small-fix

[Resourcebundle][WIP] Coding stanadard
Promotions exclusive mode
Promotion exclusivity per promotion
Attach InventoryUnit to OrderItem instead of Order
More flexible "sylius.cache" parameter.
Merge pull request #1132 from umpirsky/fix/issue-1127

Promotions exclusive mode
Specify a template for choiceFormAction.
Merge pull request #1140 from kayue/fix/sylius-cache

A more flexible "sylius.cache" parameter.
Taxon SoftDeletable
Merge pull request #1142 from kayue/patch-8

Fix Unable to find template "::_provinceChoiceForm.html.twig" bug.
Default variant on-hand should be 0.