Add xhprof to composer.json file & remove README.

composer.json

@@ -40,6 +40,13 @@
         "piwik/device-detector": "2.*"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.1"
-    }
+        "phpunit/phpunit": "~4.1",
+        "facebook/xhprof": "dev-master"
+    },
+    "repositories": [
+        {
+            "type": "vcs",
+            "url": "https://github.com/phacility/xhprof"
+        }
+    ]
 }

tests/README.xhprof.md

-
-Piwik is distributed with a copy of XHProf, the PHP profiler created by Facebook.
-
-## Installing XHProf
-
-First, XHProf must be built (this guide assumes you're using a linux variant):
-
- * 	Navigate to the XHProf extension directory.
-
-		$ cd /path/to/piwik/tests/lib/
-		$ wget http://pecl.php.net/get/xhprof
-		$ tar -xzvf xhprof
-
- * 	Build XHProf.
-
-		$ phpize
-		$ ./configure
-		$ make
-
-	xhprof.so will now exist in the ./modules directory.
-
- *	Configure PHP to use XHProf. Add the following to your php.ini file:
-
-	```
-	[xhprof]
-	extension=/path/to/piwik/tests/lib/xhprof-0.9.4/extension/modules/xhprof.so
-	xhprof.output_dir=/path/to/output/dir
-	```
-
-	Replace /path/to/output/dir with an existing directory. All your profiles will be
-	stored there.
-
-Restart your webserver and you're done.
-
-XHProf will now store and process profiles of all running PHP processes. Access the reports via the XHPprof interface.
-