updated version of GWT libs, apps and games

I am releasing today a new version of most my GWT libs, apps and games.

lib-gwt-svg 0.5.6 brings several additional features, such as support for SVG drag-and-drop and CSS/SVG backgrounds.
lib-gwt-file 0.3.1 brings a working implementation of Blob.slice and support for large files (up to 2^56 bytes long).
svgreal 0.2.2 provides support for image element edition (with drag-and-drop support) and use element edition.

Most of the games, samples and demos have been reworked to take into account a recent evolution in Firefox SVG engine which caused the apps to not function properly on Firefox any more (see https://bugzilla.mozilla.org/show_bug.cgi?id=752583 for details).