Regenerate gemspec for version 1.3.9
Regenerate gemspec for version 1.3.9

jeanlinux/datagrid,reenhanced/datagrid,sadaf2605/datagrid,artofhuman/datagrid,jeanlinux/datagrid,sadaf2605/datagrid,bogdan/datagrid,reenhanced/datagrid,bogdan/datagrid,artofhuman/datagrid