Added swich to allow override of keypad key size.
Added swich to allow override of keypad key size.

roachhd/Metro-UI-CSS,olton/Metro-UI-CSS,gencer/Metro-UI-CSS,olton/Metro-UI-CSS,MenesesEvandro/Metro-UI-CSS,gencer/Metro-UI-CSS,roachhd/Metro-UI-CSS,olton/Metro-UI-CSS,MenesesEvandro/Metro-UI-CSS