Version 1.2 (2018-03)
    o Fix export of S3 methods. 
    o Updated documentation.

Version 1.1 (2012-02)
    o Avoid estimation of dispersion parameter < 0 in glm.binomial.disp() and glm.poisson.disp().
    o The model fitted by glm.binomial.disp() and glm.poisson.disp() is updated in a new environment created from parent.frame() and globalenv() is not modified.
 
Version 1.0.1 (2009-02)
    o Bug fixes.

Version 1.0  (2003-02)
    o Initial release.
