Tests are not part of the core logic of Hyde, and they should not be
packaged as such.

Merge the huge plugin structural refactoring and retrofit changes
from the past.

*   Remove `hyde.fs` use `fswrap` package instead.
*   Remove logging functions from `hyde.util`. Use `commando.util`
    instead.
*   Remove `hyde.loader`. Use `commando.util.load_python_object`
    instead.

is present in the target directory. (Issue #21)
*   Bug Fix: Exceptions are now handled with `ArgumentParser.error`.
    (Issue #21)

Always first sort by name then by any attributes you want. Otherwise,
tests may fail.