Fix typescript warning
Removed extra line
Escaped image alt, updated .d.ts file
Cached thumbnailer module, added it as dependency
Handle missing responce time header
Merge pull request #285 from Wikia/internal-errors

Handle missing responce time header
Merge pull request #280 from Wikia/fix-ts-warning

Fix typescript warning
Merge branch 'master' of https://github.com/Wikia/mercury into HG-230
addtionalClasses -> classes