[enh] url prettify

searx/templates/result_templates/default.html

 <div class="result">
     <h3 class="result_title"><a href="{{ result.url }}">{{ result.title|safe }}</a></h3>
-    <p class="content"><span class="engines">{{ result.engine }}</span><br />{% if result.content %}{{ result.content|safe }}<br />{% endif %}<span class="url">{{ result.url }}</span></p>
+    <p class="content"><span class="engines">{{ result.engine }}</span><br />{% if result.content %}{{ result.content|safe }}<br />{% endif %}<span class="url">{{ result.pretty_url }}</span></p>
 </div>

searx/webapp.py

                 selected_categories.append(ccateg)
     query = request_data['q'].encode('utf-8')
     results = search(query, request, selected_categories)
+    for result in results:
+        if len(result['url']) > 74:
+            result['pretty_url'] = result['url'][:35] + '[..]' + result['url'][-35:]
+        else:
+             result['pretty_url'] = result['url']
     if request_data.get('format') == 'json':
         return Response(json.dumps({'query': query, 'results': results}), mimetype='application/json')
     template = render('results.html'