Fix Inflector::singularize bug with custom irregular singular rule not being parsed.
Fix Inflector::singularize bug with custom irregular singular rule not being parsed.

michaelze/cakephp,jjj117/cakephp,ndm2/cakephp,tenkoma/cakephp,gmponos/cakephp,ionas/cakephp,garethellis36/cakephp,thinkingmedia/cakephp,petteyg/cakephp,kumamidori/cakephp,jerems02/cakephp,mvdriel/cakephp,HavokInspiration/cakephp,petteyg/cakephp,davidyell/cakephp,jeffblack360/cakephp,jerems02/cakephp,justinyost/cakephp,elboletaire/cakephp,cakephp/cakephp,berrygoudswaard/cakephp,eryw/cakephp,akintoey/cakephp,elboletaire/cakephp,garethellis36/cakephp,berrygoudswaard/cakephp,tgr0ss/cakephp,thinkingmedia/cakephp,akintoey/cakephp,pbaire/cakephp,CakeDC/cakephp,HavokInspiration/cakephp,ADmad/cakephp,timhoeppner/cakephp,adopico/cakephp,CakeDC/cakephp,timhoeppner/cakephp,yinhe007/cakephp,timhoeppner/cakephp,Phillaf/cakephp,tenkoma/cakephp,ADmad/cakephp,Balachan27/cakephp,CVO-Technologies/cakephp,ionas/cakephp,dakota/cakephp,jeffblack360/cakephp,ADmad/cakephp,nrother/cakephp,michaelze/cakephp,davidyell/cakephp,yinhe007/cakephp,khoimt/cakephp-study,dkarvounaris/cakephp,yinhe007/cakephp,dkarvounaris/cakephp,kumamidori/cakephp,CVO-Technologies/cakephp,ADmad/cakephp,cakephp/cakephp,CVO-Technologies/cakephp,ndm2/cakephp,cakephp/cakephp,nrother/cakephp,tisu2tisu/cakephp,bravo-kernel/cakephp,Phillaf/cakephp,davidyell/cakephp,mvdriel/cakephp,petteyg/cakephp,mvdriel/cakephp,dakota/cakephp,burriko/cakephp,berrygoudswaard/cakephp,et304383/passbolt_api,web-player/cakephp,erikfig/cakephp,adopico/cakephp,garethellis36/cakephp,jjj117/cakephp,eryw/cakephp,ndm2/cakephp,thinkingmedia/cakephp,erikfig/cakephp,akintoey/cakephp,tenkoma/cakephp,bravo-kernel/cakephp,ionas/cakephp,mvdriel/cakephp,khoimt/cakephp-study,web-player/cakephp,garethellis36/cakephp,HavokInspiration/cakephp,gmponos/cakephp,cakephp/cakephp,eboominathan/cakephp,jjj117/cakephp,erikfig/cakephp,jerems02/cakephp,elboletaire/cakephp,burriko/cakephp,kumamidori/cakephp,cakephp-fr/cakephp,et304383/passbolt_api,tgr0ss/cakephp,tisu2tisu/cakephp,Balachan27/cakephp,bravo-kernel/cakephp,tgr0ss/cakephp,web-player/cakephp,Balachan27/cakephp,Phillaf/cakephp,justinyost/cakephp,CakeDC/cakephp,khoimt/cakephp-study,adopico/cakephp,eboominathan/cakephp,justinyost/cakephp,et304383/passbolt_api,eboominathan/cakephp,jeffblack360/cakephp,et304383/passbolt_api,pbaire/cakephp,pbaire/cakephp,et304383/passbolt_api,tenkoma/cakephp,eryw/cakephp,dakota/cakephp,petteyg/cakephp,gmponos/cakephp,dakota/cakephp,burriko/cakephp,ndm2/cakephp,michaelze/cakephp,CakeDC/cakephp,nrother/cakephp,dkarvounaris/cakephp,tisu2tisu/cakephp,cakephp-fr/cakephp,cakephp-fr/cakephp