Minilog

- Added `%(relpath)s` logging format.
- Added `verbosity` as `init()` option to work with Django admin commands.

- Initial stable release.

- Disabled automatic logging configuration when invoked by `pytest`.

- Added `reset=True` as `init()` option to replace all existing logging handlers.
- Added `exception` logging API.
- Added convenience alias: `log.c`, `log.exc`.

- Fixed bug where records were written for disabled levels.

- Exposed `logging` level constants on the `log` package.
- Added `log.WARN` as an alias of `log.WARNING`.