Python v0.3.0

What's Changed

• Ndr/update paths by @nreinicke in #8
• skip chunking if empty by @robfitzgerald in #13
• Rjf/crate readmes by @robfitzgerald in #14
• Allows multiple energy models at query time by @nreinicke in #16
• update documentation by @nreinicke in #18
• prefer boxed slices over vecs by @robfitzgerald in #20
• trigger build on release tag prefix "py-" by @robfitzgerald in #21
• To Disk Output Plugin by @nreinicke in #22
• allow route to be empty by @robfitzgerald in #26
• Improve energy model error by @nreinicke in #27
• optional distance tolerance paramter for rtree plugin by @robfitzgerald in #28

Full Changelog: v0.2.1...py-0.3.0