using v4 of EventEmitter
Merge branch 'ee-v4'
correct location of event emitter
Individual servers can now pass back information to the router if they try to serve the wrong page type
Added list of third-party JS to some docs.
Merge branch 'master' of github.com:guardian/frontend
Merge branch 'master' of github.com:guardian/frontend into content-type-redirects
Merge pull request #440 from guardian/content-type-redirects

Individual servers can now pass back information to the router if they t...
X-Accel-Redirects need to be on 200 response codes
Merge pull request #442 from guardian/content-type-redirects

X-Accel-Redirects need to be on 200 response codes
Merge branch 'master' of github.com:guardian/frontend into event