Log Message:
Update to 1.8.1:

  - Attribute modifiers, for precise queries
  - Improved calendar feature
  - Full undo capability
  - All reports now customizable
  - Command aliases can now be created
  - In addition to being a standard part of Fedora 10 and 11 (yum install task),
    task is now also a standard part of Cygwin 1.5
  - There are new demo movies on taskwarrior.org

  Please refer to the ChangeLog file for full details.  There are too many to
  list here.