Version: 2.2
Category: Fixed the name of the vignette in the vignette index entry
Text:

Version: 2.1
Category: Nothing, really, except that I had to provide new links to
        the ICL files as a result of Dropbox's new policy on shared
        files. God bless Brad's beautiful soul, 15 years dead and still
        helping us
Text:

Version: 2.0
Text: Added functions to estimate and plot the interaction model

Version: 2.0
Text: Added erf, a function to plot the empirical item response
        function

Version: 2.0
Text: Added ssm, a function to produce IRF in the sum score metric

Version: 2.0
Text: Added ifp, a function to plot IRF with error bounds.

Version: 2.0
Text: Small improvements in the tia function

Version: 2.0
Text: Links to download Brad Hanson's ICL program (see the package help
        page)

Version: 0.1.7
Date: 2014-01-23
Category: NEW FEATURES
Text: new function, tet(), to calculate, quickly, an approximate matrix
        of tetrachoric correlations.

Version: 0.1.7
Date: 2014-01-23
Category: BUG FIXES
Text: fixed a bug in function wle() which affected the variance of
        Warm's weighted estimate of ability in the case of the 3PL
        model only.