moon name sprite work finished ....
Sprite code moved into elements.js (refactoring)
Info translucent window created and 'walk through guide' system set.

JQuery is now needed as external library
jQuery stuff moved locally
small change on the max size
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