Documentation Update

- Removed references to old websites and online groups.
- Removed references to the github issue tracker.
- Added references to http://taskwarrior.org.

src/command.cpp

@@ -297,8 +297,8 @@ std::string handleVersion ()
   link.setColumnWidth (0, Table::flexible);
   link.setColumnJustification (0, Table::left);
   link.addCell (link.addRow (), 0,
-    "See http://www.beckingham.net/task.html for the latest releases and a "
-    "full tutorial.  New releases containing fixes and enhancements are "
+    "See http://taskwarrior.org for the latest releases, online documentation "
+    "and lively discussion.  New releases containing fixes and enhancements are "
     "made frequently.");
 
   // Create a table for output.