Add some more reference selection options

[mhagger]

Add some more reference selection options. The same functionality could be achieved using the existing options, but it's more convenient to have these dedicated options as shorthand:

• --no-branches, --no-tags, --no-remotes — the opposite of the existing branches, --tags, and --remotes options.
• --notes and --no-notes — include or exclude refs/notes/*.
• --stash and --no-stash — include or exclude refs/stash.

Add tests to cover the new options, driven by a grid of expected results.

/cc @chrisd8088 or @larsxschneider as possible reviewers.

[mhagger]

I forgot to mention: this fixes #77.

[mhagger]

I just rebased this branch to master, without any code changes. There was a minor textual conflict in the usage string.

/cc @ttaylorr as a possible reviewer.