2012-12-27 Helios De Rosario-Martinez <helios.derosario@ibv.upv.es>

* R/getElements.R: New common internal methods for getting model objects.

* R/interactionMeans.R: Modified to use the methods defined in getElements.R.

* R/testFactors.R (testFactors.lme, testFactors.mer): New methods.
(testFactors.default): Modified to accept lme and mer objects.
(addPredictorsToFrame, defineLHT): New internal functions.
Solved wrong table labels in glm tests.

* R/testInteractions.R: Modified to use the methods defined in getElements.R

* man: Documentation updated and revised.

* vignettes (phia.Rnw): Added section on mixed-effects models. Revised.
(bibliography.bib): New references

* NAMESPACE: importFrom(lme4, "isGLMM")
S3method(testFactors, lme)
S3method(testFactors, mer)

* Version 0.1-0.
