Add tumblr ignores
Enable wpull HTTP compression
Give up after 3 tries instead of 10 tries

Some websites have tons of images pointing to hundreds of different dead hosts, and trying 10 times makes them take too long to finish.
*Do* take a phantomjs snapshot; bump pipeline version

Some websites use JavaScript to populate the DOM with useful content, and it's nice to keep this post-JS DOM around.
pipeline: Return exit_code on exit hook. Bump version.