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Features:
* Separate `azkaban` CLI utility. This allows running workflows on Azkaban,
and uploading prebuilt archives without having to create an empty project.
* Simpler job options. `Job.get_option` and `Job.get_option_list`
should allow for easier handling of special job option names.
* Logging is now separate from the output of `Project.main`. It is now
exclusively meant to be used for debugging.
Breaking changes:
* The `Project.main` method is now deprecated in favor of the `azkaban`
executable.
* The `--user` and `URL` command line options have been combined into a single
`--url` option. The new format is '[user]protocol:endpoint'.
* `Project.merge` is renamed to `Project.merge_into` to be more explicit. Note
that the direction of the merge has also been reversed.