Update version number to 3.8.0-beta1
Update version number to 3.8.0-beta1

dakota/cakephp,ndm2/cakephp,dakota/cakephp,dakota/cakephp,CakeDC/cakephp,ndm2/cakephp,cakephp/cakephp,mvdriel/cakephp,cakephp/cakephp,CakeDC/cakephp,mvdriel/cakephp,ADmad/cakephp,cakephp/cakephp,dakota/cakephp,mvdriel/cakephp,ADmad/cakephp,cakephp/cakephp,CakeDC/cakephp,ndm2/cakephp,ADmad/cakephp,CakeDC/cakephp,ADmad/cakephp,ndm2/cakephp,mvdriel/cakephp