moved CORElearn from Import to Suggest
moved Boruta from Suggest to Import (stabilized on CRAN)
moved Boruta from Import to Suggest
handled the case where Boruta version is more than 10.0.0
fixed CRAN NOTE on documentation (describe instead of itemize)
removed all dontrun from examples (replaced by donttest when relevant)
"basics"data.frame as inputs for ridgeSIR