Version 1.4-3

- Fixed compatibility issues with lme4 1.1-4.
- Updated some methods, following development in lme4.
Version 1.4-4

Adding information about convergence errors to @optinfo.
Version 1.5

- Fixing some problems with ranef and coef for
  models with uncorrelated random effects of the
  same grouping level.
- Fixing a convergence problems and adding a warning
  if robust estimating equations are not satisfied at
  convergence.