feat: Add Development Server

Description:

• Use Flask development server when Gnar Gear is in development mode
• Enhance configure_blueprints to be fault tolerant in development mode
  • Add try / except logic to catch exceptions
  • Log stack trace of caught exceptions
  • Register failed modules in sys.modules so that they're still watched
• Update README.md with production vs. development section
• Improve tox config
• Bump version to 1.0.7