Add error highlighting to error message.
Add error highlighting to error message.

The issue as reported in #4956 was that the path was not created.
An error was being displayed but it wasn't obvious as it looked like
normal text. I think colouring the error and spacing it better will work
better.

Refs #4956

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