add piwik installation

www/analytics/libs/README.md

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+## Piwik modifications to libs/
+
+In general, bug fixes and improvements are reported upstream.  Until these are
+included upstream, we maintain a list of bug fixes and local mods made to
+third-party libraries:
+
+ * HTML/Quickform2/
+   - in r2626, php 5.1.6 incompatibility
+   - in r3040, exception classes don't follow PEAR naming convention
+ * pChart2.1.3/
+   - the following unused files were removed:
+     class/pBarcode39.class.php, class/pBarcode128.class.php,
+     class/pBubble.class.php, class/pCache.class.php, class/pIndicator.class.php,
+     class/pRadar.class.php, class/pScatter.class.php, class/pSplit.class.php,
+     class/pSpring.class.php, class/pStock.class.php, class/pSurface.class.php,
+     data/, examples/, fonts/, palettes/
+   - The bug #4206 (GD with JIS-mapped Japanese Font Support) was fixed in this
+     commit: https://github.com/piwik/piwik/commit/516c13d9b13ca3b908575eb809f7ad9d9397f0e1
+     Changed files: class/pImage.class.php class/pDraw.class.php
+ * PclZip/
+   - in r1960, ignore touch() - utime failed warning
+ * PEAR/, PEAR.php
+   - in r2419, add static keyword to isError and raiseError as it throws notices
+     in HTML_Quickform2
+   - in r2422, is_a() is deprecated for php 5.0 to 5.2.x
+ * sparkline/
+   - in r1296, remove require_once
+   - empty sparklines with floats, off-by-one errors, and locale conflict
+ * tcpdf/
+   - in 6f945465fe40021d579bc2b4b8876468da69b062 fixed a bug reported in the forums
+   - in 566c63a52e31b2b2d3e1a83f8f63e74e8d661b21 fixed another couple bugs with fopen throwing warnings
+ * Zend/
+   - strip require_once (to support autoloading)
+   - in r3694, fix ZF-10888 and ZF-10835
+   - ZF-10871 - undefined variables when socket support disabled