Version 1.0
* this is the first version of the RRF package. 

Version 1.2
* test up to sqrt(P) variables in addition to the selected variables

Version 1.3-1.4
* Guided Random Forest

Version 1.5 - 1.6
* add feaIni, so that one can pre-define features in the initial feature subset F
* add feaSet - the final feature set F selected by RRF

Version 1.7
* add feature selection for regression