Release of the Version 0.5.3

This release brings only one minor correction to the code: the previous style sheets are still valid. The most noticiable change is 6 new style sheets and the sofware documentation (in French only, for instance).

These new style sheets stands inside 3 folders (photo, tone-on-rone and gradiant) and are in 2 versions (one for each side menu). This a beginning, there will be more CSSs in the future!