3.1
-------
*** removed bug in LRTSim that led to non-sensical results. 
* now deals with testing in models where tested variance component is 0 for `m`, but not for `mA`. (Thanks, Christoph Huber-Huber!)
* now deals correctly with models returned from lmerTest::lmer (Thanks, twice, Lukas Meier)

3.0
-------
*** now using Rcpp
* removed terrible "browser()"-bug in extract.lmeDesign()
