sign in button style

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36378 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
style of cursor

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36379 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Save logged in user for offline use

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36380 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e