Update rake to 0.8.2.

New features:

* Switched from getoptlong to optparse (patches supplied by Edwin
  Pratomo).

* The -T option will now attempt to dynamically sense the size of the
  terminal. The -T output will only self-truncate if the output is a
  tty. However, if RAKE_COLUMNS is explicitly set, it will be honored
  in any case. (Patch provided by Gavin Stark).

* The following public methods have been added to rake task objects:

  * task.clear -- Clear both the prerequisites and actions of the
    target rake task.
  * task.clear_prerequisites -- Clear all the existing prerequisites
    from the target rake task.
  * task.clear_actions -- Clear all the existing actions from the
    target rake task.
  * task.reenable -- Re-enable a task, allowing its actions to be
    executed again if the task is invoked.

* Changed RDoc test task to have no default template. This makes it
  easier for the tempate to pick up the template from the environment.

* Default values for task arguments can easily be specified with the
  :with_defaults method. (Idea for default argument merging supplied
  by (Adam Q. Salter)

(minskim)