README update, spelling corrections, utf-8 gizmos

Heyp,

Looks like http://redmine.ookook.fr/projects/isbg is down and I cursed a bit trying to implement isbg nicely. Using the WayBack Machine, I took the documentation and added it back to the README so it does not depend on external ressources.

I also grabbed StarsoftAnalysis's commit that fixed spelling issues.

Finally, I fixed some UTF-8 tags.

--
Louis-Philippe