Added pattern exclusion support for "-implementation" packages

[verenaroe]

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Additional information

This PR adds support for regex pattern exclusions. By default it excludes "-implementation" and therefore fixes issue #93.

Notes

Should I add all virtual packages to named exclusions? Can they easily be found?

[icanhazstring]

Nice, this is what I was aiming for. A simple solution to remove -implementation packages.
Very well done, thank you 💪

LGTM 🚀

[icanhazstring]

Just a quick side question. Do you have Twitter handle? Would like so write a nice post 🙂

You can also just follow me @icanhazstring so that you don't need to share it here 😉

[verenaroe]

I don't use social media at all 😬 Maybe you can use my github name or website? Please send the post to me, I would love to read it 😃 Saw your random-issue-picker in the PHP Annotated Monthly from Jetbrains 😀

[icanhazstring]

Can you send me an email to ando@icanhazstring.net so that I can send you the tweet before posting it :)