upgrade 1.5.10 gemspec
upgrade 1.5.10 gemspec

jay3126/bullet,eileencodes/bullet,sideci-sample/sideci-sample-bullet,jay3126/bullet,rstacruz/bullet,hannahbot/bullet,rstacruz/bullet,flyerhzm/bullet,PikachuEXE/bullet,danp60/bullet,PikachuEXE/bullet,flyerhzm/bullet,flyerhzm/bullet,yakovenkodenis/bullet,dwb/bullet,theass/bullet,rrosenblum/bullet,dwb/bullet,sho-h/brakefast,danp60/bullet,hannahbot/bullet,sideci-sample/sideci-sample-bullet,yakovenkodenis/bullet,eileencodes/bullet,theass/bullet,rrosenblum/bullet,sho-h/brakefast