First commit of skybox (not working)
Merge branch 'development' into marcus

Conflicts:
	src/maingui.js
Merge branch 'development' into marcus

Conflicts:
	src/maingui.js
First commit of skybox (not working)
added mga_incipit + skybox + tests
adding forgotten files
Merge branch 'marcus' of https://github.com/esa/jupiter_tour into marcus

Conflicts:
	src/elements.js
	src/maingui.js