Fix #1720: Specify absolute version of Webpack (#1721)
Fix #1720: Specify absolute version of Webpack (#1721)

Webpack `2.1.0-beta.23` has breaking changes related to the configuration structure, so forcing `2.1.0-beta.22` as a temporary fix by removing the `^`.
teaguecnelson/tn-tellis-bds,sacredwebsite/sage,NicBeltramelli/sage,agusgarcia/sage9,gkmurray/sage,ptrckvzn/sage,c50/c50_roots,PCHC/pharmacyresidency2017,ChrisLTD/sage,democracy-os-fr/sage,JulienMelissas/sage,PCHC/pharmacyresidency2017,democracy-os-fr/sage,generoi/sage,PCHC/pharmacyresidency2017,democracy-os-fr/sage,kalenjohnson/sage,ChrisLTD/sage,teaguecnelson/tn-tellis-bds,kalenjohnson/sage,ChrisLTD/sage,gkmurray/sage,sacredwebsite/sage,ptrckvzn/sage,teaguecnelson/tn-tellis-bds,roots/sage,c50/c50_roots,agusgarcia/sage9,mckelvey/sage,skemantix/sage,gkmurray/sage,JulienMelissas/sage,levito/kleineweile-wp-theme,levito/kleineweile-wp-theme,gkmurray/sage,JulienMelissas/sage,kalenjohnson/sage,sacredwebsite/sage,mckelvey/sage,agusgarcia/sage9,c50/c50_roots,generoi/sage,levito/kleineweile-wp-theme,roots/sage,generoi/sage,NicBeltramelli/sage,ChrisLTD/sage,skemantix/sage,ptrckvzn/sage,NicBeltramelli/sage,mckelvey/sage,skemantix/sage