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
Fix #99: JPEG image not loading with cairo 1.8.x
Test in cairo 1.8 and 1.10 with tox
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
Avoid duplicating the check for cairo MIME data support.
Changelog for v0.19.2
Merge branch 'master' of git://github.com/pikhovkin/WeasyPrint
Add Sergey Pikhovkin to AUTHORS.
Fix a possible use-after-free.
URL fetching: use an intermediate function rather than a wrapper
Do not get MIME types base on URLs.
Small refactoring.
URL fetching: enforce closing sockets/files with a context manager.
Image loading: only swallow exception related to fetching or decoding.
Fix #84: Mak loading an author stylesheet not fatal.
Fix #101: Write PDF bookmarks/outline correctly.

The PDF spec says that the target of a bookmark/outline entry contains
the *object ID* of the target page. We previously wrote the *page number*,
which for some reason still worked in some PDF viewers.
Add Pierre-Alain Mignot to AUTHORS.
Tentative fix for #97: w.HTML(positional_argument) crashes Python < 2.6.5
Docs: add an example combining documents into one PDF file.
Add PDF metadata parsed from HTML. Fix #77.

<title> → /Title
<meta name=author> → /Author
<meta name=description> → /Subject
<meta name=keywords> → /Keywords
<meta name=generator> → /Creator
<meta name=dcterms.created> → /CreationDate
<meta name=dcterms.modified> → /ModDate
"WeasyPrint vX.Y" → /Producer