v1.31: Docker environment

What's Changed

• Change local dev environment setup to use Docker by @jmuzina in #27

Full Changelog: v1.3...v1.31

v1.3

• Dependency installation is significantly less byzantine
• App uses environment variables instead of app.cfg file

Full Changelog: v1.2...v1.3

Alpha v1.2

Draft submission edition

Alpha v1.1

Alpha version with mobile viewability refinements

Alpha v.1

First fully featured, functional edition of GPX Visualizer