made AES block size a constant with google constant naming style
made AES block size a constant with google constant naming style

jbtule/keyczar-dev,matiasherranz/keyczar,divegeek/keyczar,jbtule/keyczar,kaulkie/keyczar,frewsxcv/keyczar,Turlough/keyczar,divegeek/keyczar,asacamano/keyczar,divegeek/keyczar,kaulkie/keyczar,asacamano/keyczar,divegeek/keyczar,kaulkie/keyczar,matiasherranz/keyczar,kaulkie/keyczar,divegeek/keyczar,asacamano/keyczar,jbtule/keyczar,Turlough/keyczar,Turlough/keyczar,frewsxcv/keyczar,Turlough/keyczar,matiasherranz/keyczar,matiasherranz/keyczar,kaulkie/keyczar,jbtule/keyczar-dev,Turlough/keyczar,frewsxcv/keyczar,Turlough/keyczar,jbtule/keyczar-dev,jbtule/keyczar,jbtule/keyczar,jbtule/keyczar,matiasherranz/keyczar,frewsxcv/keyczar,jbtule/keyczar-dev,frewsxcv/keyczar,matiasherranz/keyczar,divegeek/keyczar,frewsxcv/keyczar,jbtule/keyczar-dev,matiasherranz/keyczar,kaulkie/keyczar,jbtule/keyczar-dev,kaulkie/keyczar,asacamano/keyczar,frewsxcv/keyczar,asacamano/keyczar,jbtule/keyczar,asacamano/keyczar,Turlough/keyczar,jbtule/keyczar-dev,divegeek/keyczar,asacamano/keyczar,jbtule/keyczar