0.16.0

What's Changed

• Improved documentation and addded utils module by @david-zwicker in #56
• Improved examples in docs by @david-zwicker in #57
• Established configuration system by @david-zwicker in #59
• Added pyupgrade to format source code by @david-zwicker in #60
• Some maintainance talks by @david-zwicker in #61
• Replaced assert statements with proper checks by @david-zwicker in #62
• Much improved handling of trajectories by @david-zwicker in #63

Full Changelog: 0.15.0...0.16.0