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