Read spherical coordinates

What's Changed

• Add tests for box dimensions and global box center (fix #5) by @devdanzin in #9
• Test invalid data by @devdanzin in #10
• Feature/read spherical coordinates by @dancergraham in #12
• refactor: use simple point reader from e57 library by @dancergraham in #14

New Contributors

• @devdanzin made their first contribution in #9

Full Changelog: 0.1.0-a3...0.0.0-a4