`matchingPatterns` method

[epszaw]

Description

This PR adds .matchingPatterns methods, which returns matched patterns. It's very useful, when you need to determine required patterns by given strings and then use them.

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This PR doesn't contain any breaking changes.

I didn't add support for negative lookup, because I can't imaging use-cases for them. But, if you think, that them also should be implemented – let me know.

New Feature

• [x] If this is a big feature with breaking changes, consider opening an issue to discuss first. This is completely up to you, but please keep in mind that your pr might not be accepted.
• [x] Run unit tests to ensure all existing tests are still passing
• [x] Add new passing unit tests to cover the code introduced by your pr
• [x] Update the readme (see readme advice)
• [x] Add your info to the contributors array in package.json!

[epszaw]

@jonschlinkert can someone make review of these changes? :)