Add Weather

[Glavin001]

Use OpenWeatherMap for retrieving weather data: http://openweathermap.org/api

• [ ] Clouds: See demo for Three.js clouds: http://www.mrdoob.com/#/131/Clouds
• [ ] Rain: Possible implementation of rain through a Three.js particular system: http://www.aerotwist.com/tutorials/creating-particles-with-three-js/
• [ ] Lightening.
• [ ] Surrounding custom environment: http://aerotwist.com/tutorials/create-your-own-environment-maps/