Moving to a group center camera on it (with autozoom for large group)

Moving code to Three.js r75

Updated Milky Way data & add button to toggle infos.

Improve distant view + fix on galaxy scale

- add a 2D background Milky Way image on far view
- fix on galaxy scale
- testing new labels for distant view

Update README.md

Add multiple improvements - Released minified ED3D

First test for far galaxy view