fix for tree slug handler

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

[2.4] Fix unique slugs with the TreeSlugHandler

patch for nested tree sync method

Merge pull request #1647 from kbond/2.4-php7-nested-set-fix

PHP 7 nested set fix for 2.4

odm field annotation backported

v2.4.20

change odm string annotation to field with type string

regression for php 5.3 support

Merge pull request #1639 from Loscillo/Loscillo-patch-1

Fix incorrect syntax for arrays in PHP 5.3

recently introduced bug fix in mapping

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

fix for #1634

Allow gedmo:slug to be overrided by attributeOverride

Merge pull request #1633 from krafas/sluggable-attribute-override

Allow gedmo:slug to be overrided by attributeOverride

Recognize "translatable" in "attribute-overrides"

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

2.4.x compatibility for PR#1631

next tag to replace 2.4.14

Merge pull request #1623 from aminin/patch-2

Add closure tree operations in 2.4.x

add closure tree functions

Merge pull request #1623 from aminin/patch-2

Add closure tree operations in 2.4.x

Maintenance release for v2.4.x

Merge pull request #1529 from dvapelnik/patch-1

[v2.4.12] php5.3.2 not supported short array definition