0.1:
Initial version uploaded to CRAN

0.2:
Markus added checkGeneSymbols and unit tests.

0.2.1:
changes to checkGeneSymbols:
* Added unmapped.as.na option
* set stringsAsFactors=FALSE so output columns are character class instead of factor
* use return(df) instead of invisible(df).

0.2.2:
* license to GPL >= 2.0 (from GPL > 2.0)
* convert all putative gene symbols to upper-case, except for orf.
  This catches symbols that are non-standard because of lower-case
  letters.
* added inst/extdata/genenames_org.csv for full transparency