Improve .mailmap
Improve .mailmap

Simplified existing mappings and added few more.

elboletaire/cakephp,ndm2/cakephp,tenkoma/cakephp,mvdriel/cakephp,cakephp-fr/cakephp,cakephp/cakephp,berrygoudswaard/cakephp,garethellis36/cakephp,dakota/cakephp,mvdriel/cakephp,thinkingmedia/cakephp,thinkingmedia/cakephp,CakeDC/cakephp,garethellis36/cakephp,ndm2/cakephp,ADmad/cakephp,davidyell/cakephp,mvdriel/cakephp,petteyg/cakephp,cakephp/cakephp,garethellis36/cakephp,ndm2/cakephp,berrygoudswaard/cakephp,elboletaire/cakephp,petteyg/cakephp,CakeDC/cakephp,petteyg/cakephp,ADmad/cakephp,cakephp/cakephp,dakota/cakephp,davidyell/cakephp,dakota/cakephp,tenkoma/cakephp,cakephp-fr/cakephp,berrygoudswaard/cakephp,CakeDC/cakephp,ADmad/cakephp,ndm2/cakephp,tenkoma/cakephp,cakephp-fr/cakephp,davidyell/cakephp,cakephp/cakephp,CakeDC/cakephp,thinkingmedia/cakephp,petteyg/cakephp,garethellis36/cakephp,ADmad/cakephp,tenkoma/cakephp,dakota/cakephp,elboletaire/cakephp,mvdriel/cakephp