Add --all-versions option to backfill historical PyPI versions.

[freakboy3742]

Adds a --all-versions option so that you can build all historical versions of a package in one pass.

Also captures and logs build failures, rather than hard crashing.

Replaces PyPISimple with direct calls on the PyPI API, because PyPISimple seems to be using the older simple API, rather than the newer JSON API. The simple API is missing a lot of useful metadata.

Fixes #8.

PR Checklist:

• [x] All new features have been tested
• [x] All new features have been documented
• [x] I have read the CONTRIBUTING.md file
• [x] I will abide by the code of conduct