Enhancement - Hooks

- Implemented API calls: task_get_due, task_get_end, task_get_entry,
  task_get_start, task_get_until and task_get_wait.
- Implemented unit tests for API calls.
- Implemented new Record::get_ulong method.
- Implemented unit tests for get_ulong.

src/Record.cpp

@@ -157,6 +157,16 @@ int Record::get_int (const std::string& name) const
   return 0;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+unsigned long Record::get_ulong (const std::string& name) const
+{
+  Record::const_iterator i = this->find (name);
+  if (i != this->end ())
+    return strtoul (i->second.value ().c_str (), NULL, 10);
+
+  return 0;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 void Record::set (const std::string& name, const std::string& value)
 {