mime-types 2.6

The mime-types library provides a library and registry for information about MIME content type definitions. It can be used to determine defined filename extensions for MIME types, or to use filename extensions to look up the likely MIME type definitions. MIME content types are used in MIME-compliant communications, as in e-mail or HTTP traffic, to indicate the type of content which is transmitted. The mime-types library provides the ability for detailed information about MIME entities (provided as an enumerable collection of MIME::Type objects) to be determined and used. There are many types defined by RFCs and vendors, so the list is long but by definition incomplete; don't hesitate to add additional type definitions. MIME type definitions found in mime-types are from RFCs, W3C recommendations, the {IANA Media Types registry}[https://www.iana.org/assignments/media-types/media-types.xhtml], and user contributions. It conforms to RFCs 2045 and 2231. This is release 2.6 with two new experimental features. The first new feature is a new default registry storage format that greatly reduces the initial memory use of the mime-types library. This feature is enabled by requiring +mime/types/columnar+ instead of +mime/types+ with a small performance cost and no change in *total* memory use if certain methods are called (see {Columnar Store}[#columnar-store] for more details). The second new feature is a logger interface that conforms to the expectations of an ActiveSupport::Logger so that warnings can be written to an application's log rather than the default location for +warn+. This interface may be used for other logging purposes in the future. mime-types 2.6 is the last planned version of mime-types 2.x, so deprecation warnings are no longer cached but provided every time the method is called. mime-types 2.6 supports Ruby 1.9.2 or later.