Get proper dfsHost
went back to the idea with /assets/_cb*/ links for static assets
changed X-Backend header to X-Served-By
Merge pull request #124 from Wikia/caching-changes

Caching changes
Merge branches 'MOB-1975' and 'master' of https://github.com/Wikia/interactive-maps into MOB-1975
Update messages returned from DB