Automate building and tagging workflow

[lee-dohm]

Right now, this all has to be done relatively manually. This means that I have to:

1. Merge the latest master to the latest releases/v* branch
2. Create the latest semver tag
3. Delete the local v* tag
4. Delete the remote v* tag
5. Create the local v* tag pointing to the same commit
6. Push the commits
7. Push the tags
8. Create the GitHub release object for the latest semver tag and check the box to publish to the Marketplace

With the tools mentioned in JasonEtco/create-an-issue#55, I should be able to reduce this to:

1. Merge the latest master to the latest releases/v* branch
2. Create the latest semver tag
3. Push the tags
4. Create the GitHub release object for the latest semver tag and check the box to publish to the Marketplace

And I probably don't even need to worry about the releases/v* branch anymore