Update Overview.html

Fixed Nicolas' name and affiliation.
Update Overview.html

Fixed 'idot' namespace (terms now resolvable).
Update Overview.html

Changed 'PrimarySource' (class) into 'primarySource' (property).
Update Overview.html

Not relying on UTF8 to properly render accents.
Fixed encoding issues.
Merge pull request #8 from perkeo/master

Various corrections (affiliation, namespaces and HTML encoding of characters).