Merge pull request doctrine-extensions#1684 from spiroski/v2.4.x

Fix PHP7 error "Cannot use 'String' as a class name".

Merge pull request doctrine-extensions#1669 from freshcells/v2.4.x

Fix node deletion for similar paths with materialized path strategy (2.4.x)

Merge pull request doctrine-extensions#1650 from cmfcmf/unique-trees-2.4

[2.4] Fix unique slugs with the TreeSlugHandler

Merge pull request doctrine-extensions#1647 from kbond/2.4-php7-neste…

…d-set-fix

PHP 7 nested set fix for 2.4

change odm string annotation to field with type string

Merge pull request doctrine-extensions#1639 from Loscillo/Loscillo-pa…

…tch-1

Fix incorrect syntax for arrays in PHP 5.3

Merge pull request doctrine-extensions#1635 from vbartusevicius/v2.4.x

fix for doctrine-extensions#1634

Merge pull request doctrine-extensions#1633 from krafas/sluggable-att…

…ribute-override

Allow gedmo:slug to be overrided by attributeOverride

Merge pull request doctrine-extensions#1632 from vbartusevicius/v2.4.x

2.4.x compatibility for PR#1631

Merge pull request doctrine-extensions#1623 from aminin/patch-2

Add closure tree operations in 2.4.x