* supybot-plugin-create: compactify import statements in the template
* supybot-plugin-create: prefer importlib over imp on Python >= 3.4
The imp module is deprecated as of Python 3.4[1], with importlib being the successor. However, importlib is only available in Python 2.7+ and 3.1+, so we should still use a fallback.
[1]: https://docs.python.org/3.6/library/imp.html
* test: add test cases for supybot-plugin-create
* -plugin-create: fix errors when only a subset of args are given
* -plugin-create: rename --real-name to --author/-a
These days, working under a pseudonym or alias is not unheard of, so putting emphasis on real names feels somewhat out of place.
* -plugin-create: add -d as an alias to --desc for consistency
