[ResourceBundle] The collection form type has been improved
Updated to describe defaulting to property name behaviour

Updated the spec for the Twig extension, so it describes the behaviour that happens when rendering a sorting link with no field name.
I've also renamed the "it_should_not_render_sorting_link" to "it_should_not_render_sorting_link_when_not_sortable" so it's more consistent with the new scenario name, and also a little more explicit about what it does.
Fixed renderSortingLink not defaulting to property

Fixed renderSortingLink not defaulting to using the property name when sortable is set to false.
Merge pull request #2202 from LewisW/master

[ResourceBundle] Fixed renderSortingLink not defaulting to property name
[AttributeBundle] Fix key names for validation_groups config
Merge pull request #2203 from adamelso/attribute-validation-groups-config

[AttributeBundle] Fix key names for validation_groups config
Merge pull request #2197 from aRn0D/form-collection

[ResourceBundle] The collection form type has been improved
[Promotion] Add basic gift card code
[Promotion] Add missing const & extend fixtures
Fix promotion related specs
Add PoC for gift card validation to prevent cheats
Add frontend page where user can see all used giftcards ever
Add migration script
Fix reduction of gift card amount after order confirmation
Add Originator Support