 review signal selection vignette: remove library ggplot and Not shown on screen
 review signal selection vignette: remove library ggplot and Not shown on screen

sessionInfo:
R version 3.2.2 (2015-08-14)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

locale:
[1] LC_COLLATE=English_United Kingdom.1252  LC_CTYPE=English_United Kingdom.1252   
[3] LC_MONETARY=English_United Kingdom.1252 LC_NUMERIC=C                           
[5] LC_TIME=English_United Kingdom.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] git2r_0.13.1

loaded via a namespace (and not attached):
[1] tools_3.2.2
bjcochrane/popgenInfo,NESCent/popgenInfo