anchor.diff:  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
      bitops_1.0-6.tar.gz \
      caTools_1.17.1.tar.gz \
  -   digest_0.6.9.tar.gz \
  -   Rcpp_0.12.5.tar.gz \
  +   digest_0.6.10.tar.gz \
  +   Rcpp_0.12.6.tar.gz \
      htmltools_0.3.5.tar.gz \
      yaml_2.1.13.tar.gz \
      stringi_1.1.1.tar.gz \
      magrittr_1.5.tar.gz \
  -   mime_0.4.tar.gz \
  +   mime_0.5.tar.gz \
      stringr_1.0.0.tar.gz \
      highr_0.6.tar.gz \
      formatR_1.4.tar.gz \
  
positive.code: RUN DEBIAN_FRONTEND=noninteractive wget \
     http://archive.linux.duke.edu/cran/src/contrib/knitr_1.13.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/yaml_2.1.13.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/Rcpp_0.12.5.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/htmltools_0.3.5.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/caTools_1.17.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/bitops_1.0-6.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/digest_0.6.9.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/stringr_1.0.0.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/markdown_0.7.7.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/highr_0.6.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/formatR_1.4.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/evaluate_0.9.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/mime_0.4.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/stringi_1.1.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/magrittr_1.5.tar.gz
  
  
negative.code: 
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
     jsonlite_0.9.22.tar.gz \
     digest_0.6.10.tar.gz \
     memoise_1.0.0.tar.gz \
     whisker_0.3-2.tar.gz \
     bitops_1.0-6.tar.gz \
     RCurl_1.95-4.8.tar.gz \
     Rcpp_0.12.6.tar.gz \
     plyr_1.8.4.tar.gz \
     R6_2.1.2.tar.gz \
     curl_0.9.7.tar.gz \
     openssl_0.9.4.tar.gz \
     mime_0.5.tar.gz \
     httr_1.2.0.tar.gz \
     rstudioapi_0.6.tar.gz \
     withr_1.0.2.tar.gz \
  