Add `url` alias to the Filterer.
Document the URL filter in the README.
Fix some typos with missing ::filter in the README.
Merge pull request #28 from nubs/add-url-to-filterer

Add url alias to filterer and document in README.
Add contribution guidelines.
Merge pull request #29 from nubs/contribution-guidelines

Add contribution guidelines.
Fix casing of "Pull Requests".
Merge pull request #30 from nubs/contribution-guidelines

Fix casing of "Pull Requests".
Use an isset instead of array_key_exists
Use coversDefaultClass in any tests that are not already.
Add default support.
Merge pull request #32 from gaillard/master

Default support and coversDefaultClass
Add registerAlias()
Make setFilterAliases() use registerAlias()
Merge pull request #22 from chadicus/master

Add registerAlias
Fix broken link to Filterer in README.
Merge pull request #34 from gaillard/master

Fix broken link to Filterer in README.
Remove PHP 5.4 features.

Remove shorthand array syntax
Remove callable typehint
Boo.
Merge pull request #35 from chadicus/master

Remove PHP 5.4 array syntax. Boo.