anchor.diff:     https://mirrors.nics.utk.edu/cran/src/contrib/formatR_1.5.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/evaluate_0.10.1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/mime_0.5.tar.gz \
  -   https://mirrors.nics.utk.edu/cran/src/contrib/stringi_1.1.5.tar.gz \
  +   https://mirrors.nics.utk.edu/cran/src/contrib/stringi_1.1.6.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/magrittr_1.5.tar.gz
   
   
  
positive.code:    git2r_0.19.0.tar.gz \
     devtools_1.13.4.tar.gz \
     brew_1.0-6.tar.gz \
     stringi_1.1.5.tar.gz \
     magrittr_1.5.tar.gz \
     stringr_1.2.0.tar.gz \
     roxygen2_5.0.1.tar.gz \
  
negative.code: # update the R packages we will need for knitr
  RUN DEBIAN_FRONTEND=noninteractive wget \
     https://mirrors.nics.utk.edu/cran/src/contrib/knitr_1.17.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/yaml_2.1.16.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/Rcpp_0.12.14.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/htmltools_0.3.6.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/caTools_1.17.1.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/bitops_1.0-6.tar.gz \
  