Add support for milestones

[etgottli]

Added functionality for the milestones api

[HowardWolosky]

Thanks for the contribution! I've noted some requested changes for you to make.

[HowardWolosky]

Good update. Minor issues remaining.

[HowardWolosky]

Thanks for the updates. Minor changes requested. Will be interested in hearing from @danbelcher-MSFT as well.

[danbelcher-MSFT]

My nitpick here is that these test names are generic and so don't tell you anything about what is actually being tested. When you run the tests, you should see:

For creating a new milestone:
    ...
    'Should be in the closed state'

[HowardWolosky]

Thanks for the contribution!

[HowardWolosky]

Can you please get this branch up-to-date with what's in master? There are currently conflicts preventing the merge.

[etgottli]

@HowardWolosky I had merged master into this branch before you made that conflicts comment, and I'm not seeing any conflicts anymore. The only thing blocking the merge now is that "The base branch restricts merging to authorized users" and I'm not authorized. I assume you are able to merge the PR?

[HowardWolosky]

Thanks -- issue was on my end. GitHub was saying that I couldn't rebase your changes on top of master due to merge conflicts, but it had no problem just squashing your changes and then merging on top of master.