Updating to latest masters

Deployed new service (f00852507bed9f86fc24198db5a474dd1881f392):
* Log metabook on error.
* Allow logging extended information from the backends.

Deployed new bundler (55aa6bea33e29053b76b2043d2c96bcb2f4f1964):
* Save title redirect information.
* Increase retries of truncated downloads from 3 to 5.
* Don't crash if a referenced image was deleted or otherwise missing.
* Redirect more logging through new log framework.
* Handle missing contributor information.

Deployed new latexer (03c8b04355e31d2b3d2aa80c505215bcd13a2676):
* Properly escape HTML anchors and id attributes.
* Pass additional details to logger on XeLaTeX failures.

Change-Id: I0a1748c121b208779e0fcc31e75a9adf4e6683ae
Merge branch 'master' into wmf-deploy

Change-Id: I9b460f257a5c71039b6d01d0da1d5595f64d18cd