psss / did / 551

82%

master: 79%

Pull #160

travis-ci

Refactor plugin loader to allow eggs and custom plugin locations.

The idea is to allow users to write their own plugins without needing to
download the code. They can pip install or dnf install and use the config
file to point to their custom plugins.

* Refactor the loading logic to use importlib and pkgutil so it can load plugins
from an egg and arbitrary places on the filesystem.

* Add a custom_plugins option to the general section of the config. Users
can add a space separated list of directories where custom plugins reside.

Example:
```
[general]
email = Joe User <joe@example.com>
custom_plugins = ~/.did/custom_plugins

[thing]
type = thing
```

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