refactor(webpack): enable throwing errors on webpack build errors
refactor(webpack): enable throwing errors on webpack build errors

driftyco/ionic-app-scripts,michaelgeorgeattard/ionic-app-scripts,driftyco/ionic-app-scripts,michaelgeorgeattard/ionic-app-scripts,michaelgeorgeattard/ionic-app-scripts,rolandjitsu/ionic-app-scripts,driftyco/ionic-app-scripts,rolandjitsu/ionic-app-scripts,rolandjitsu/ionic-app-scripts