only show providerPanel if user is online

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36889 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for #4632

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36890 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Use phonegap 3.5

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36891 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e