Add FileMatchers

[vasekbrychta]

Would it be possible to add FileMatchers?

[aik099]

Sure. Please send a PR.

If you've found any more inconsistencies between the Java library version and this PHP port, then please open corresponding issues/PRs for adding missing stuff.

[vasekbrychta]

Ok, I'll prepare the PR.

[vasekbrychta]

Would you prefer the file matchers to match string paths, SplFileInfo objects or both?

[aik099]

@vasekbrychta , both:

• if string is provided it's wrapped into SplFileInfo class
• if SplFileInfo object is provided, then it's used as is

For reference: https://github.com/hamcrest/JavaHamcrest/blob/master/hamcrest/src/main/java/org/hamcrest/io/FileMatchers.java