Add way to match files based on complete filename and not only their extension.

[sk-]

Currently the rules for deciding what linters is going to be used only takes into account the extension of the file. This has several problems, one is that some files don't have an extension (for example, .gitlint), and in some other cases there are specific linters that can be used for some files. For example for travis.yml there is a specific linter, taht is only valid for that kind of files. The same happens for the phpunit configuration file, which can be called phpunit.xml.dist, in which case we only want to apply the xml linter to those files and not to all files ending with .dist.