IANA registry update 20140522
Fixing two tooling problems.

- The `template` for `audio/amr-wb+` was showing up as just `amr-wb+`,
  which will not produce a usable URL to the template. In cases where a
  file reference is the same as the subtype, change the file reference
  to be the same as `type/subtype`.

- Make update matching case-insensitive.