API cleanup, get rid of JsObject and GetProperty() methods that don`t return JsValue

shell/src/MatchesCommand.cpp

Index: shell/src/MatchesCommand.cpp
===================================================================
--- a/shell/src/MatchesCommand.cpp
+++ b/shell/src/MatchesCommand.cpp
@@ -21,20 +21,20 @@ void MatchesCommand::operator()(const st
   {
     ShowUsage();
     return;
   }
 
   AdblockPlus::FilterPtr match = filterEngine.Matches(url, contentType, documentUrl);
   if (!match)
     std::cout << "No match" << std::endl;
-  else if (match->GetProperty("type", "") == "exception")
-    std::cout << "Whitelisted" << std::endl;
+  else if (match->GetType() == AdblockPlus::Filter::TYPE_EXCEPTION)
+    std::cout << "Whitelisted by " << match->GetProperty("text")->AsString() << std::endl;
   else
-    std::cout << "Blocked" << std::endl;
+    std::cout << "Blocked by " << match->GetProperty("text")->AsString() << std::endl;
 }
 
 std::string MatchesCommand::GetDescription() const
 {
   return "Returns the first filter that matches the supplied URL";
 }
 
 std::string MatchesCommand::GetUsage() const