Flask-plugin

*This version does not compatible with previous version.*

**Plugin now have a new `plugin.json` config file!**

For more info, visit docs at [Plugin Config](https://docs.flask-plugin.org/config).
This change made for future online plugin market.

Bug fixed:

- [Fixed bug when sending signal](https://github.com/guiqiqi/flask-plugin/commit/d8c0e64b310a1450217b87e118af680eb19d89da)
- [Fixed invalid lru_cache parameter](https://github.com/guiqiqi/flask-plugin/commit/262cd895192b63cf1167f6fe02a75b55f1ea6cbb)

- Fixed bug could cause `plugin.endpoints` incorrect.
- Fixed bug could cause `app.url_rule` clean not functionally.
- Fixed bug that `config.blueprint` cannot be used as plugin's domain.
- Deprecate function `states.StatesMachine.limit` with wrong behavior.
- Add documentation.
- More details now in error raising.

- For user who never called `plugin.endpoint`, previous version may cause a problem that unload operation invalid.
- Add development install task.

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- 对于不使用 `plugin.endpoint` 方法的用户，上一个版本可能会导致无效的插件卸载。
- 增加了开发中的安装配置。

**Abandoned version.**

**该版本被废弃。**

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First test release version.

第一个测试版本。