Release v1.5.0-beta dev into staging

Part of #290 (closed)

Release v1.5.0-beta

Added

• Reference to DISCLAIMER.md in README.md

Changed

• Changed LICENSE.md to standard language
• Suggested citation in README.md
• code.json content for provisional release
• http urls to https

Fixed

• Outdated USGS Code of Scientific Conduct link in README.md