update Piwik to version 2.16 (fixes #91)

www/analytics/vendor/piwik/piwik-php-tracker/LICENSE

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+Copyright (c) 2014, Piwik Open Source Analytics
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the {organization} nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

www/analytics/vendor/piwik/piwik-php-tracker/README.md

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+# PHP Client for Piwik Analytics Tracking API
+
+The PHP Tracker Client provides all features of the [Piwik Javascript Tracker](http://developer.piwik.org/api-reference/tracking-javascript), 
+such as Ecommerce Tracking, Custom Variable, Event tracking and more. 
+
+## Documentation and examples 
+Check out our [Piwik-PHP-Tracker developer documentation](http://developer.piwik.org/api-reference/PHP-Piwik-Tracker) and 
+[Piwik Tracking API guide](http://piwik.org/docs/tracking-api/).
+
+## Requirements:
+* json extension (json_decode, json_encode)
+* CURL or STREAM extensions (to issue the HTTP request to Piwik)
+
+## License
+
+Released under the [BSD License](http://www.opensource.org/licenses/bsd-license.php)

www/analytics/vendor/piwik/piwik-php-tracker/composer.json

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+{
+    "name": "piwik/piwik-php-tracker",
+    "description": "PHP Client for Piwik Analytics Tracking API",
+    "keywords": ["piwik","tracker","analytics"],
+    "homepage": "http://piwik.org",
+    "license": "BSD-2-Clause",
+    "authors": [
+        {
+            "name": "The Piwik Team",
+            "email": "hello@piwik.org",
+            "homepage": "http://piwik.org/the-piwik-team/"
+        }
+    ],
+    "support": {
+        "forum": "http://forum.piwik.org/",
+        "issues": "https://github.com/piwik/piwik-php-tracker/issues",
+        "source": "https://github.com/piwik/piwik-php-tracker"
+    },
+    "autoload": {
+        "classmap": ["."]
+    }
+}