Bug Fix - #252

- Fixed bug that prevented the chaining of two attributes with
  different modifiers to effect a date range, such as:
    task ls due.after:8/1/2009 due.before:8/31/2009
  Thanks to John Florian.

src/Task.cpp

@@ -67,8 +67,8 @@ bool Task::operator== (const Task& other)
     return false;
 
   foreach (att, *this)
-    if (att->first != "uuid")
-      if (att->second.value () != other.get (att->first))
+    if (att->second.name () != "uuid")
+      if (att->second.value () != other.get (att->second.name ()))
         return false;
 
   return true;