Use to_h to convert params to a hash

@rymai There are other places in the API, which does not use to_h but directly feeds the Hashie::Mash to a service. Shall we update those as well?

Shall we update those as well?

Maybe test those with Ruby 2.1 and see if they fail, but that probably wouldn't hurt to fix them all anyway!

Thanks @razer6, there are failing specs. Please fix and assign to @rspeicher since I'm off tomorrow! Thanks!

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Mentioned in issue #24444 (closed)

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@stanhu I added a helper. For now only the milestones API uses this helper but other APIs should be refactored to do the same. But this is out of scope of this MR.

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@razer6 One question.

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