* Add instructions for installing a TLS server certificate on nginx
* Fix link to nginx in README.md
* List all three ways to get a webserver TLS certificate. With some
hints on which to chose for which purpose.
* Do not add CSR instructions, because they can change over time and each CA may
have slightly different requirements.
* Add a hint about setting protocol selection.
* Fix typo in provider-setup.md
* "build_linux": building for GNU/linux
* "build": Building for both linux and windows (cross build)
* Place the generate binaries under "binaries/" directory
* Improve echo messages
* Makefile with the following targets
** build for (linux system)
** build_win (windows system)
** build_tag (build from the last tag)
** clean for (removing the binaries)
* Adjust README file
