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

http://greenkeeper.io/
seven-cd/ng2-file-upload,albpara/ng2-file-upload,valor-software/ng2-file-upload,albpara/ng2-file-upload,valor-software/ng2-file-upload,valor-software/ng2-file-upload,seven-cd/ng2-file-upload,seven-cd/ng2-file-upload