Roxygen2 4.1.1

• Formatting of the Authors@R field in the DESCRIPTION file is now retained
  (@jranke, #330).
• The collate roclet falls back to base::strwrap() when generating the
  collate field. This makes roxygen2 compatible with the next version of
  stringr.
• New "vignette" roclet. This vignette automatically rebuilds all out of date
  vignettes (#314).
• An off-by-one error in the C++ Roxygen preparser was fixed.
• The new @backref tag makes it possible to override the sourceref for
  R code generators like Rcpp (@krlmlr, #291, #294).