add TransIP as a provider

[skoef]

Added a provider for TransIP, a large DNS provider in Europe. Let me know what you think!

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[skoef]

I've signed the CLA in the meantime

[dionbosschieter]

+1

[skoef]

@Raffo or @linki, do you guys think you could review this MR? If not, perhaps you could have other reviewers appointed?

[njuettner]

Thanks for your PR 👍, it's nice to have TransIP as a new provider. I made some comments, other than that LGTM.

[skoef]

Thanks for reviewing @njuettner, I've processed all comments and pulled master a last time

[njuettner]

/lgtm
/approve

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