Add Organization Webhooks Preview

[sigmavirus24]

See the announcement for more details

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[antoine-g]

Hi Ian,
Do you think that this is an opportunity to create a directory orgs for the organizations? I would do it as a prerequisite to this addition.
I think a lot of code will be common with the repositories webhooks. I would consider a generic hook model and inheritance for the repository and organization hook.
Any thought or objection?

[sigmavirus24]

Do you think that this is an opportunity to create a directory orgs for the organizations? I would do it as a prerequisite to this addition.

It's not clear to me why this is necessary.

[antoine-g]

You were right this is not necessary.

I have started a WIP branch to add the Organization hooks support: develop...antoine-g:feature/org-hooks.

Main changes that are open to discussion:

• New models RepositoryHook and OrganizationHook inherit from Hook.
• New test file for orgs
• OrganizationHook support added to Organization

Current issues:

• New org hooks tests fail. I think you would like to use the github3py organization but I don't have the permissions to make the tests succeed for the first time and record the cassettes.
• I am unclear with the test files under tests/. Were they migrated to tests/unit and tests/integration?
• This introduces a breaking change for the use of repository hooks.
• Some functions from Hook are tested twice, once for each implementation. Should I write tests dedicated to the Hook class instead?

I would be happy to get some feedback. Thanks