docs/website: add OpenWide/Smile as sponsor

As mentionned in
http://lists.busybox.net/pipermail/buildroot/2016-July/167050.html,
OpenWide/Smile has sponsored the Buildroot Summer Camp, by allowing
Romain Naour to participate, and by paying the food expenses for the
event.

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Cc: Jérémy Rosen <jeremy.rosen@smile.fr>
[Thomas:
 - renamed the logo file
 - remove useless white area in the logo, so that it appears bigger on
   the website]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

docs/website/sponsors.html

@@ -9,6 +9,23 @@
     <div class="panel-body">
 
       <div class="row">
+	<div class="col-sm-12">
+	  <div class="panel panel-default">
+	    <div class="panel-body">
+	      <div class="col-sm-4">
+		<a href="http://ingenierie.openwide.fr">
+		  <img class="img-responsive center-block" src="images/owi-smile-logo.png"/>
+		</a>
+	      </div>
+	      <div class="col-sm-8">
+		<a href="http://ingenierie.openwide.fr">OpenWide/Smile</a> is sponsoring
+		the Buildroot Summer Camp taking place on July 1-5 2016 in Toulouse, France. OpenWide/Smile is
+		sponsoring the participation of Romain Naour and paid the food expenses for the meeting participants.
+	      </div>
+	    </div>
+	  </div>
+	</div>
+
 	<div class="col-sm-12">
 	  <div class="panel panel-default">
 	    <div class="panel-body">