Support for X-Forwarded headers

Support has been added for X-Forwarded-Port and X-Forwarded-Proto.
This will enable reverse proxy servers to feed the public port
and protocol to eventstore. These values will be used in generating
URLs in responses.
Use requestedUrl for ProjectionsController links

Was using the UriTemplateMatch which contained the local Uri.
Merge pull request #244 from adbrowne/reverseproxy

Support for X-Forwarded headers