Enhancement - Sequence object

- Implemented sequence object to encapsulate the worries of parsing
  sequences.
- Implemented unit tests.

src/Sequence.h

@@ -0,0 +1,48 @@
+////////////////////////////////////////////////////////////////////////////////
+// task - a command line task list manager.
+//
+// Copyright 2006 - 2009, Paul Beckingham.
+// All rights reserved.
+//
+// This program is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free Software
+// Foundation; either version 2 of the License, or (at your option) any later
+// version.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// this program; if not, write to the
+//
+//     Free Software Foundation, Inc.,
+//     51 Franklin Street, Fifth Floor,
+//     Boston, MA
+//     02110-1301
+//     USA
+//
+////////////////////////////////////////////////////////////////////////////////
+#ifndef INCLUDED_SEQUENCE
+#define INCLUDED_SEQUENCE
+
+#include <vector>
+#include <string>
+
+class Sequence : public std::vector <int>
+{
+public:
+  Sequence ();                           // Default constructor
+  Sequence (const std::string&);         // Parse
+  ~Sequence ();                          // Destructor
+
+  void parse (const std::string&);
+  void combine (const Sequence&);
+
+private:
+  bool validId (const std::string&);
+};
+
+#endif
+////////////////////////////////////////////////////////////////////////////////