add cred_token() to last push
add cred_token() to last push

sessionInfo:
R version 3.2.3 (2015-12-10)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.11.2 (El Capitan)

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

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_3.2.3    memoise_0.2.1  knitr_1.12     digest_0.6.8   devtools_1.9.1
bjcochrane/popgenInfo,NESCent/popgenInfo