Changes

Improve handling of mime type when importing H5P and XAPI.

When importing H5P and XAPI zip the mime type is determined by file extensions (unlike with EPUBs where it is explicitly specified). Hence H5PContentImporter and XapiZipContentImporter need to use the MimeTypeHelper to determine the mime type so that SaveLocalUriAsBlob understands which content should be gzipped.

Fix EmbeddedHttpServer to prevent NanoHTTPD generating invalid gzipped responses. NanoHTTPD adds an extra content-encoding: gzip header without removing the content-encoding: identity header.

Use XapiJson when generating the Xapi link to avoid encoding default parameters in the Xapi URL.
 (commit: 01373c6)

Bump version.
 (commit: 2aca356)