Adopt Google Style

[apetro]

Shallow adoption: documents intention, bumps into compliance this one time, but does not add automation to stay compliant.

Resolves #19 .

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Definition of Done

• [x] Documented (intention in CONTRIBUTING.md)
• [x] Fails gracefully (nothing bad happens if fail to style)
• [x] Tested (tests still pass)
• [x] Secure (no security considerations)
• [x] Adds no defects (Arguable, since automating style checking becomes an obvious TODO.)
• [x] Shippable. Path is clear to promote to production
• [x] Maintainable (Arguable, since style enforcement not automated.)
• [x] Configurable (nothing to configure)
• [x] Readable
• [x] Validates and sanitizes user input (no input to validate)
• [x] Styled (with panache)