Make negation in site-filters do something more sensible.

--HG--
extra : rebase_source : f49abc17efc3d111757f76b4a144f8f49db19a1a

common/locale/en-US/repeat.xml

@@ -230,7 +230,7 @@
 
 <p>
     In most cases, any of the above may be prefixed with a <tt>!</tt> character
-    to invert the sense of the match.
+    to exclude matching sites.
 </p>
 
 <h2 tag="using-scripts">Using scripts</h2>

common/modules/contexts.jsm

@@ -47,7 +47,9 @@ var Group = Class("Group", {
 }, {
     compileFilter: function (patterns) {
 
-        function siteFilter(uri) siteFilter.filters.every(function (f) f(uri) == f.result);
+        function siteFilter(uri)
+            let (match = array.nth(siteFilter.filters, function (f) f(uri), 0))
+                match && match.result;
 
         if (!isArray(patterns))
             patterns = Option.splitList(patterns, true);