chore(package): update webpack to version 1.12.15
chore(package): update webpack to version 1.12.15

http://greenkeeper.io/
rangle/batarangle,rangle/augury,vanessayuenn/batarangle,clbond/augury,rangle/augury,clbond/augury,rangle/augury,vanessayuenn/batarangle,clbond/augury,rangle/batarangle,vanessayuenn/batarangle,rangle/batarangle,clbond/augury,rangle/batarangle,vanessayuenn/batarangle,rangle/augury