Add the ASL at ETH Zurich to the list of users.

Change-Id: I535b954114c028ae7b6c3b6df3213c9fd79f85de

docs/source/users.rst

diff --git a/docs/source/users.rst b/docs/source/users.rst
index 928d960..d04927d 100644
--- a/docs/source/users.rst
+++ b/docs/source/users.rst
@@ -29,6 +29,12 @@
 * `Obvious Engineering <http://obviousengine.com/>`_ uses Ceres for
   bundle adjustment for their 3D photography app `Seene
   <http://seene.co/>`_.
+* The `Autonomous Systems Lab <http://www.asl.ethz.ch/>`_ at ETH
+  Zurich uses Ceres for
+
+  * Camera and Camera/IMU Calibration.
+  * Large scale optimization of visual, inertial, gps and
+    wheel-odometry data for long term autonomy.
 
 .. _bundle adjustment: http://en.wikipedia.org/wiki/Structure_from_motion
 .. _Street View: http://youtu.be/z00ORu4bU-A