Dbus-fast

Feature
* Small speed ups to unmarshall message creation ([27](https://github.com/Bluetooth-Devices/dbus-fast/issues/27)) ([`0bce72a`](https://github.com/Bluetooth-Devices/dbus-fast/commit/0bce72a76a6af0d7b3c731e08393652747e6c53a))

Feature
* Handle kwargs in signal callback ([26](https://github.com/Bluetooth-Devices/dbus-fast/issues/26)) ([`2e8076b`](https://github.com/Bluetooth-Devices/dbus-fast/commit/2e8076b14abf297b83eb2c81b0cacff405845d95))

Feature
* Add unpack variants option ([20](https://github.com/Bluetooth-Devices/dbus-fast/issues/20)) ([`cfad28b`](https://github.com/Bluetooth-Devices/dbus-fast/commit/cfad28bd2ba8dccf4c3a591461bb666871e4cbba))

Fix
* Disconnect connected buses at end of tests ([25](https://github.com/Bluetooth-Devices/dbus-fast/issues/25)) ([`e438890`](https://github.com/Bluetooth-Devices/dbus-fast/commit/e43889091bf7b21f6ffd27544d74cc1d57db22d2))

Fix
* Marshall boolean correctly ([23](https://github.com/Bluetooth-Devices/dbus-fast/issues/23)) ([`ca2a3c1`](https://github.com/Bluetooth-Devices/dbus-fast/commit/ca2a3c1aa86f1f0b6372929f099e8594dab2697f))

Feature
* Allow varargs callback for signals ([22](https://github.com/Bluetooth-Devices/dbus-fast/issues/22)) ([`a3379c7`](https://github.com/Bluetooth-Devices/dbus-fast/commit/a3379c74ad8f8da1eb15b6cd941d9bea6867b5f9))

Feature
* Improve unmarshalling performance ([18](https://github.com/Bluetooth-Devices/dbus-fast/issues/18)) ([`4362b93`](https://github.com/Bluetooth-Devices/dbus-fast/commit/4362b93fc84406adfa026b6573bc076327c71c5b))