nginx HSTS module

The ngx_http_hsts module provides support for HTTP Strict Transport Security in nginx.

Dependencies

Unpack the nginx_ sources:
```
$ tar zxvf nginx-1.x.x.tar.gz
```
Unzip the sources for the digest module:
```
$ unzip master.zip
```
Change to the directory which contains the nginx_ sources, run the configuration script with the desired options and be sure to put an --add-module flag pointing to the directory which contains the source of the digest module:
```
$ cd nginx-1.x.x
$ ./configure --add-module=../nginx-http-hsts-master  [other configure options]
```
Build and install the software:
```
$ make && sudo make install
```
Configure nginx using the module's configuration directives.

You can enable HSTS by adding the following lines into a main, server or location section in your nginx configuration file:

hsts  "2016-01-29" includeSubdomains;

Syntax:	`hsts` "`YYYY-MM-DD`" \| `off` [`includeSubdomains`] [`preload`]
Default:	`off`
Context:	main, server, location
Description:	Enable or disable HSTS. The date is until when the browser shall access the server in a secure-only fashion. It is suggested to put this the day before your certificate expires. The optional `includeSubdomains` specifies all subdomains should be HTTPS as well. For the optional `preload` token see: https://hstspreload.appspot.com/

$ cd test
$ NGINX=/home/erik/nginx-1.9.1/objs/nginx ./test.sh