gnu: r-httr: Update to 1.2.1.

* gnu/packages/statistics.scm (r-httr): Update to 1.2.1.

gnu: r-openssl: Update to 0.9.4.

* gnu/packages/statistics.scm (r-openssl): Update to 0.9.4.

gnu: r-rversions: Update to 1.0.3.

* gnu/packages/statistics.scm (r-rversions): Update to 1.0.3.

gnu: r-multitaper: Update to 1.0-12.

* gnu/packages/statistics.scm (r-multitaper): Update to 1.0-12.

gnu: r-xml2: Update to 1.0.0.

* gnu/packages/statistics.scm (r-xml2): Update to 1.0.0.

gnu: r-r6: Update to 2.1.3.

* gnu/packages/statistics.scm (r-r6): Update to 2.1.3.

gnu: r-crayon: Update to 1.3.2.

* gnu/packages/statistics.scm (r-crayon): Update to 1.3.2.

gnu: r-knitr: Update to 1.14.

* gnu/packages/statistics.scm (r-knitr): Update to 1.14.

gnu: r-mime: Update to 0.5.

* gnu/packages/statistics.scm (r-mime): Update to 0.5.

gnu: r-dbi: Update to 0.5-1.

* gnu/packages/statistics.scm (r-dbi): Update to 0.5-1.

gnu: r-lazyeval: Update to 0.2.0.

* gnu/packages/statistics.scm (r-lazyeval): Update to 0.2.0.

gnu: r-stringr: Update to 1.1.0.

* gnu/packages/statistics.scm (r-stringr): Update to 1.1.0.

gnu: r-stringi: Update to 1.1.1.

* gnu/packages/statistics.scm (r-stringi): Update to 1.1.1.

gnu: r-plyr: Update to 1.8.4.

* gnu/packages/statistics.scm (r-plyr): Update to 1.8.4.

gnu: r-permute: Update to 0.9-4.

* gnu/packages/statistics.scm (r-permute): Update to 0.9-4.

gnu: r-mgcv: Update to 1.8-14.

* gnu/packages/statistics.scm (r-mgcv): Update to 1.8-14.

gnu: r-rcpp: Update to 0.12.7.

* gnu/packages/statistics.scm (r-rcpp): Update to 0.12.7.

gnu: r-digest: Update to 0.6.10.

* gnu/packages/statistics.scm (r-digest): Update to 0.6.10.

gnu: r-biocparallel: Update to 1.6.6.

* gnu/packages/bioinformatics.scm (r-biocparallel): Update to 1.6.6.

gnu: r-genomicranges: Update to 1.24.3.

* gnu/packages/bioinformatics.scm (r-genomicranges): Update to 1.24.3.