Add a package.json for the loadtest code.

Change-Id: I7d3536699734bd97984687954248d011161cabe6
Updating to latest masters

Deployed new service (2946c8901cbd5fcb8abf7bb8cb63b579066bbe17):
* Speed up/cache directory size computation in health check (bug 71260).

Deployed new latexer (144bdd2962702abaa468a18c343509a0945c11e4):
* Support Simplified and Traditional Chinese scripts.
* Don't crash if images are inside `<dt>` tags.
* Fix TeX escaping of `[]`.
* Fix "There's no line here to end." crasher (`<br>` after `<dd>`).
* Ensure that we switch to the latin font where necessary.
* Indic language support (fixes for Assamese, Gujarati, Marathi, Oriya,
  and Punjabi).

Change-Id: Iecba9d0dd2a6f9c11a004bc97ab0e403192c3072
Merge branch 'master' into wmf-deploy

Change-Id: I3df89db596aeca8dae4829dd36c7a135e71c1aae