Revert "Add nginx 1.13.1, remove nginx 1.11.13"
Revert "Add nginx 1.13.1, remove nginx 1.11.13"

- 30 day notice for adding 1.13.x expires on 2017-06-09

[#146295321]

This reverts commit ebfca73d218dd81b23fceb035b2e6969bfaca0e2.

cloudfoundry/staticfile-buildpack,cloudfoundry/staticfile-buildpack,cloudfoundry/staticfile-buildpack,cloudfoundry/staticfile-buildpack