Begin new version.
Implementing is() method in generic classes.
Fixing typo in docblock.
Bump version requirement to 5.5.0.
Make sox work on temporary files.
Formatting.
Use new array syntax.
Adding gravity to crop function.
Updating travis configuration to match PHP version requirement.

While this branch is in development keep testing on 5.4 and see if we can later drop the version requirement to 5.4.
Replacing usage of e modifier.
Updating Freedesktop glob database with new recent one having weights.

Breaking changes:

* Changing expected MIME-Type for .flac extension. audio/flac is now not
  vendor prefixed anymore. Detecting extension for audio/x-flac without
  simplifying will now fail; detect for audio/flac instead.

* Adding xsl to list of prefreferred extensions as xsl is now its
  own MIME-Type with two extensions available; application/xml
  will not return .xsl/.xslt extensions as a result anymore, use
  application/xsl for that. Adding test for new xsl MIME-Type.

Non-breaking changes:

* Fixing expected order of bzip extensions; .bz2 already in preferred
  extensions; no behavior change when using the Mime_Type class to
  detect extension for application/x-bzip.

* Fixing expected order of css extensions; .css already in preferred
  extensions; no behavior change when using the Mime_Type class to
  detect extension for text/css.

* Fixing expected order of gettext translation extensions; .mo already
  in preferred extensions; no behavior change when using the Mime_Type
  class to detect extension for application/x-gettext-translation.

* Adding .gem to the list of extensions for application/tar; no behavior
  change when using the Mime_Type class to detect the extension for
  application/tar as .tar is already in the list of preferred
  extensions.

* Changing expected order of extensions for text/plain; no behavior
  change when detecting extension for text/plain as .txt is already in
  the list of preferred extensions.

* Adding .f4a to the list of extensions for audio/mp4; no behavior
  change when using the Mime_Type class to detect the extension for
  audio/mp4 as .m4a is already in the list of preferred
  extensions.
Updating Freedesktop magic.db with most recent version.

* Re-enabling previously failing tests.
* Re-check and updating comments on previosly failing tests.
Adding tests for webm.
Better test name; designating usage of snippet.
Extracting integration tests from fileinfo unit test.
Adding test for webm.
Fix fopen modes.
Dropping b flag from all fopen modes.
Adding composer.json.
Fix keywords usage.