update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/Feedback/stylesheets/feedback.less

@@ -1,11 +1,4 @@
 #feedback-faq {
-  color: #5e5e5c;
-  width: 675px;
-  font-size: 14px;
-
-   strong {
-    color: #5e5e5c;
-  }
 
   ul {
     list-style: none;
@@ -14,14 +7,12 @@
     line-height: 18px;
   }
 
-  p {
+  .header_full, p {
     padding-bottom: 0px;
-    line-height: 1.7em;
   }
 
-  a {
-    color: #5176a0;
-    text-decoration: none;
+  p {
+    line-height: 1.7em;
   }
 
   .piwik-donate-call {
@@ -56,7 +47,8 @@
     }
 
     hr {
-      background-color: #CCC;
+      margin-top: 45px;
+      background-color: @color-silver-l90;
       height: 1px;
       border: 0px;
     }