chore(package): update eslint to version 3.15.0 (#3966)
chore(package): update eslint to version 3.15.0 (#3966)

https://greenkeeper.io/
concoursbyappointment/keystoneRedux,vokal/keystone,trentmillar/keystone,danielmahon/keystone,matthewstyers/keystone,Pop-Code/keystone,andrewlinfoot/keystone,naustudio/keystone,andrewlinfoot/keystone,trentmillar/keystone,trentmillar/keystone,vokal/keystone,ratecity/keystone,ONode/keystone,naustudio/keystone,frontyard/keystone,Pop-Code/keystone,benkroeger/keystone,benkroeger/keystone,benkroeger/keystone,naustudio/keystone,frontyard/keystone,danielmahon/keystone,andrewlinfoot/keystone,matthewstyers/keystone,ONode/keystone,vokal/keystone,danielmahon/keystone,frontyard/keystone,ratecity/keystone,concoursbyappointment/keystoneRedux,matthewstyers/keystone