implemented svg type passing in CocoaHTTPServer

[bormind]

Return Content-Type image/svg+xml explicitly form HTTPDataResponse and PackageResourceResponse for svg files

[rkwright]

This was resolved long ago. Closing

[danielweck]

@rkwright this was actually never merged into launcher-OSX, only "ported" (and improved, actually) specifically for launcher-iOS: https://github.com/readium/SDKLauncher-iOS/pull/18/files
...baring in mind that this is now in the "shared" RDServices (readium-sdk repository):
https://github.com/readium/readium-sdk/tree/develop/Platform/Apple/RDServices
See related email discussion: https://groups.google.com/d/msg/readium-dev/3OLunjnfRh8/56_55qGcf0YJ

I am reopening this Pull Request, just to keep track of the "mime type" / "http headers" issue (not just specific to SVG). The feature branch will need to be cleaned-up as well. Eventually ; sooner rather than later ; we need to update launcher-OSX to use RDServices, so that we do not have to juggle two concurrent codebases anymore (which are now functionally-identical, but not quite in synch due to historical reasons).

[danielweck]

So, let us merge this Pull Request specifically for Launcher-OSX, as this fixes a serious issue (#11).

Note that Launcher-iOS has a more elegant solution in RDServices (broader mime-type coverage), as per the links in my comment above. Eventually (sooner rather than later), we should migrate SDKLauncher-OSX to RDServices.