Log Message:
Update to 2.17

Upstream changes:
version 2.17: Fri Jan 26 23:42:01 CET 2018

        Fixes:
        - when picking a preferred type for an extension, do prefer the type
          with the same minor-name.  Issue triggered by [Henry van Styn]
        - remove iana obsoleted types

version 2.16: Tue 23 Jan 12:14:39 CET 2018

        Fixes:
        - collecting of IANA info has stalled: logic rewritten
          Discovered by [Julien Lüthi]

        Improvements:
        - move scripts and source files into MANIFEST.extra
        - update types and extensions

version 2.15: Fri 19 Jan 17:23:56 CET 2018

        Improvements:
        - moved to GIT and GitHUB.