Revert "CLEANUP: wurfl: remove dead, broken and unmaintained code"

This reverts commit 8e5e1e7bf000f2603a085c76be118214d22c55b4.

The following patches will fix this code and may be backported.
diff --git a/INSTALL b/INSTALL
index b7a8c4c..9df17ca 100644
--- a/INSTALL
+++ b/INSTALL
@@ -316,6 +316,7 @@
 
     doc/DeviceAtlas-device-detection.txt   for DeviceAtlas
     doc/51Degrees-device-detection.txt     for 51Degrees
+    doc/WURFL-device-detection.txt         for Scientiamobile WURFL
 
 
 4.9) Miscellaneous