Revision history for Signal-Mask

0.004   25-09-2010
        Fixed up MANIFEST

0.003   24-09-2010
        Added Signal::Pending
        Made scalar values of the tied hashed more meaningful

0.002   07-09-2010
        Don't export anything by default
        Use thread specific signal masks
        Include the last signal number
        Give a proper NA on Windows

0.001   31-08-2010
        First version, released on an unsuspecting world.

