Merge remote-tracking branch 'upstream/master' into python_bindings

Former-commit-id: 362d5db31489bf6dcc51b9002070ca915f22a6da

README.md

@@ -1,6 +1,6 @@
 # libigl - A simple C++ geometry processing library
 [![Build Status](https://travis-ci.org/libigl/libigl.svg?branch=master)](https://travis-ci.org/libigl/libigl)
-[![Build status](https://ci.appveyor.com/api/projects/status/mf3t9rnhco0vhly8?svg=true)](https://ci.appveyor.com/project/danielepanozzo/libigl-6hjk1)
+[![Build status](https://ci.appveyor.com/api/projects/status/mf3t9rnhco0vhly8/branch/master?svg=true)](https://ci.appveyor.com/project/danielepanozzo/libigl-6hjk1/branch/master)
 ![](libigl-teaser.png)
 
 <https://github.com/libigl/libigl/>