Updated based on the IANA registry.
Modernizing the Travis configuration.
Fix a bug with MIME::Types#type_for.

* MIME::Types.type_for('unknown') should return [], not [nil].
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.
Finalizing 2.3 release
adds ttf and otf extensions to application/font-snft

as per: http://www.iana.org/assignments/media-types/application/font-sfnt
Merge pull request #66 from xentek/ttf-and-otf-as-font-snft

Add ttf and otf extensions to application/font-sfnt
Added mime type for MS Outlook application

Added content type ‘application/vnd.ms-outlook’ for the application MS
Outlook with the file extension ‘.msg’. This is not registered in IANA
but found the content type at
http://www.digitalpreservation.gov/formats/fdd/fdd000379.shtml.

Made changes to avoid failure on travis

Reverted back the changes
Fixing text of the Licence.
Allow Ruby head versions to fail on Travis.
Tracking object usage.

- Found in github/mime-types at a504206b.
Reorganize benchmarking.
Return an enumerator when no block is given.

- I had apparently missed this lesson of being a good Ruby citizen over
  the last twelve years or so. Regardless, it's a damned fine idea.

- Found in SamSaffron/mime-types at bdc7c442.
Improving the performance of MIME::Types#type_for

- The performance improvement is about 20–25%.
Unsort extensions, restore old sort order.

Resolves #71.
Adding MIME::Type#friendly.
Adding reg, ps1, and vbs extensions.

Fix #69.
Documenting convert methods in support.
Increasing robustness of MIME updating.