Copy list

Copy list if the element is inserted on each page (eg. as https://gist.github.com/pikhovkin/5642563), else expanding table.column_positions
Copy table.column_positions

Copy list if the element is inserted on each page (eg. as https://gist.github.com/pikhovkin/5642563), else expanding table.column_positions
Merge branch 'master' of git://github.com/pikhovkin/WeasyPrint
Add Sergey Pikhovkin to AUTHORS.