update Piwik to version 2.16 (fixes #91)

www/analytics/vendor/piwik/decompress/README.md

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+# Piwik/Decompress
+
+Component providing several adapters to decompress files.
+
+[![Build Status](https://travis-ci.org/piwik/component-decompress.svg?branch=master)](https://travis-ci.org/piwik/component-decompress)
+[![Coverage Status](https://coveralls.io/repos/piwik/component-decompress/badge.png?branch=master)](https://coveralls.io/r/piwik/component-decompress?branch=master)
+[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/piwik/component-decompress/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/piwik/component-decompress/?branch=master)
+
+It supports the following compression formats:
+
+- Zip
+- Gzip
+- Tar (gzip or bzip)
+
+With the following adapters:
+
+- `PclZip`, based on the [PclZip library](http://www.phpconcept.net/pclzip/)
+- `ZipArchive`, based on PHP's [Zip extension](http://fr.php.net/manual/en/book.zip.php)
+- `Gzip`, based on PHP's native Gzip functions
+- `Tar`, based on the [Archive_Tar library](https://github.com/pear/Archive_Tar) from PEAR
+
+## Installation
+
+With Composer:
+
+```json
+{
+    "require": {
+        "piwik/decompress": "*"
+    }
+}
+```
+
+## Usage
+
+All adapters have the same API as they implement `Piwik\Decompress\DecompressInterface`:
+
+```php
+$extractor = new \Piwik\Decompress\Gzip('file.gz');
+
+$extractedFiles = $extractor->extract('some/directory');
+
+if ($extractedFiles === 0) {
+    echo $extractor->errorInfo();
+}
+```
+
+## License
+
+The Decompress component is released under the [LGPL v3.0](http://choosealicense.com/licenses/lgpl-3.0/).