Adds Tenancy/Contacts and Contact Groups

[fr3nch13]

You're right, it is pretty trivial to create new Entity definitions.

Anyway, I needed contacts and contact groups, so I figured I'd add them here. As I work through my project, and find other entities that have a relationship with contacts, I'll open another PR to add those relationships.

[thde]

@fr3nch13 thank you! Could you rebase your branch? I'll create a release as soon as this one is merged.

[fr3nch13]

Done. I'll most likely be adding more entities/relationships in the coming days, but a release with this one would be greatly appreciated!

[thde]

It still creates conflicts. So I wait for now.

[fr3nch13]

In Github it's showing:

No conflicts with base branch
Changes can be cleanly merged.

Am I missing somethings?

[fr3nch13]

From my end, the merge conflict was in the spec/netbox_client_ruby/api/dcim/site_spec.rb because I updated it to use the described_class. But that was the only conflict.

When I rebased, everything was resolved on my end, so I'm not able to see what you're seeing.

[fr3nch13]

Can we approve this PR? Is there anything else you need from me?

[thde]

I already did that two weeks ago, but the branch still had conflicts:

This branch cannot be rebased due to conflicts

I rebased it and merged your changes in #96

[fr3nch13]

Thank you @thde i really appreciate it. I'm sure I'll have more changes and more PRs. :-)