uploaded face tracking example

Author: cciliber

.gitignore

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 node_modules/*
-build/*
+build/*
+npm-debug.log

YarpJS/include/YarpJS_Wrapper.h

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-
+        
 
 #ifndef YARP_JS_WRAPPER_H
 #define YARP_JS_WRAPPER_H

examples/face_tracker/README.md

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+
+<a name='example-stream-video'></a>
+# Stream Video (a yarpview with yarp.js)
+
+<p align='center'>
+<img src="https://github.com/robotology/yarp.js/blob/master/images/example_browser_stream_video.png" width="60%">
+</p>
+
+This examples shows how to replicate the basic functionalities of a [yarpview](http://www.yarp.it/yarpview.html) to visualize images from the YARP network. The application opens a port `/yarpjs/img:i` and images sent to this port from the YARP network are visualized on the page. (Thanks to [Vtikha](https://github.com/vtikha) for posing in the image above).