upgrades to webpack@2.1.0-beta.15
upgrades to webpack@2.1.0-beta.15

sebastian-software/advanced-boilerplate,brettsnaidero/bsd,sergiokopplin/react-universally,ueno-llc/starter-kit-universally,kennethtruong/react-webapp,ueno-llc/starter-kit-universally,LorbusChris/react-universally,oyeanuj/react-universally,deanslamajr/trakta.co,diondirza/react-universally,pebie/react-universally-node-config,igorsvee/react-ssr,ctrlplusb/react-universally,sebastian-software/edgestack