Update Yaml.php
Update Yaml.php

Allow materializedPath tree strategy to primary key as TreePathSource
jmcclell/DoctrineExtensions,sroze/DoctrineExtensions,Padam87/DoctrineExtensions,Viburnum/DoctrineExtensions,SocialbitGmbH/DoctrineExtensions,tomazahlin/DoctrineExtensions,nirav-programmer/DoctrineExtensions,edigu/DoctrineExtensions,pmishev/DoctrineExtensions,teohhanhui/DoctrineExtensions,CiscoVE/DoctrineExtensions,jeroendesloovere/DoctrineExtensions,Preis24/DoctrineExtensions,l3pp4rd/DoctrineExtensions,anesse/DoctrineExtensions,eliberty/DoctrineExtensions,aramalipoor/DoctrineExtensions,blazarecki/DoctrineExtensions,lengpiseth/DoctrineExtensions,marc-j/DoctrineExtensions,gadelkareem/DoctrineExtensions,birko/DoctrineExtensions,cmfcmf/DoctrineExtensions,hhjcz/DoctrineExtensions,mablae/DoctrineExtensions,notrix/DoctrineExtensions,akd3vs/DoctrineExtensions,aplysie/DoctrineExtensions,lafourchette/DoctrineExtensions