update Piwik to version 2.16 (fixes #91)

www/analytics/vendor/piwik/referrer-spam-blacklist/README.md

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+This is a community-contributed list of [referrer spammers](http://en.wikipedia.org/wiki/Referer_spam) maintained by [Piwik](http://piwik.org/), the leading open source web analytics platform.
+
+## Usage
+
+The list is stored in this repository in `spammers.txt`. This text file contains one host per line.
+
+You can [download this file manually](https://github.com/piwik/referrer-spam-blacklist/blob/master/spammers.txt), download the [whole folder as zip](https://github.com/piwik/referrer-spam-blacklist/archive/master.zip) or clone the repository using git:
+
+```
+git clone https://github.com/piwik/referrer-spam-blacklist.git
+```
+
+### PHP
+
+If you are using PHP, you can also install the list through Composer:
+
+```
+composer require piwik/referrer-spam-blacklist
+```
+
+Parsing the file should be pretty easy using your favorite language. Beware that the file can contain empty lines.
+
+Here is an example using PHP:
+
+```php
+$list = file('spammers.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+```
+
+### Nginx
+
+Nginx's `server` block can be configured to check the referer and return an error:
+
+```nginx
+if ($http_referer ~ '0n-line.tv') {return 403;}
+if ($http_referer ~ '100dollars-seo.com') {return 403;}
+...
+```
+When combined, list exceeds the max length for a single regex expression, so hosts must be broken up as shown above.
+
+Here is a bash script to create an nginx conf file:
+```bash
+sort spammers.txt | uniq | sed 's/\./\\\\./g' | while read host; 
+do 
+    echo "if (\$http_referer ~ '$host') {return 403;}" >> /etc/nginx/referer_spam.conf
+done;
+```
+
+you would then `include /etc/nginx/referer_spam.conf;` inside your `server` block
+
+Now as a daily cron job so the list stays up to date:
+
+```bash
+0 0 * * * cd /etc/nginx/referrer-spam-blacklist/ && git pull > /dev/null && echo "" > /etc/nginx/referer_spam.conf && sort spammers.txt | uniq | sed 's/\./\\\\\\\\./g' | while read host; do echo "if (\$http_referer ~ '$host') {return 403;}" >> /etc/nginx/referer_spam.conf; done; service nginx reload > /dev/null
+```
+
+
+### In Piwik
+
+This list is included in each [Piwik](http://piwik.org) release so that referrer spam is filtered automatically. Piwik will also automatically update this list to its latest version every week.
+
+## Contributing
+
+To add a new referrer spammer to the list, [click here to edit the spammers.txt file](https://github.com/piwik/referrer-spam-blacklist/edit/master/spammers.txt) and create a pull request. Alternatively you can create a [new issue](https://github.com/piwik/referrer-spam-blacklist/issues/new). In your issue or pull request please explain where the referrer domain appeared and why you think it is a spammer. **Please open one pull request per new domain**.
+
+If you open a pull request, it is appreciated if you keep one hostname per line, keep the list ordered alphabetically, and use [Linux line endings](http://en.wikipedia.org/wiki/Newline).
+
+Please [search](https://github.com/piwik/referrer-spam-blacklist/issues) if somebody already reported the host before opening a new one.
+
+### Subdomains
+
+Piwik does sub-string matching on domain names from this list, so adding `semalt.com` is enough to block all subdomain referrers too, such as `semalt.semalt.com`.
+
+However, there are cases where you'd only want to add a subdomain but not the root domain. For example, add `referrerspammer.tumblr.com` but not `tumblr.com`, otherwise all `*.tumblr.com` sites would be affected.
+
+### Sorting
+
+To keep the list sorted the same way across forks it is recommended to let the computer do the sorting. The list follows the merge sort algorithm as implemented in [sort](https://en.wikipedia.org/wiki/Sort_(Unix)). You can use sort to both sort the list and filter out doubles:
+
+```
+sort -uf -o spammers.txt spammers.txt
+```
+
+## Disclaimer
+
+This list of Referrer spammers is contributed by the community and is provided as is. Use at your own discretion: it may be incomplete (although we aim to keep it up to date) and it may contain outdated entries (let us know if a hostname was added but is not actually a spammer).
+
+## License
+
+Public Domain (no copyright).