Update symfony/process to fix hhvm issues

composer.lock

@@ -222,17 +222,17 @@
         },
         {
             "name": "symfony/process",
-            "version": "v2.5.4",
+            "version": "v2.5.5",
             "target-dir": "Symfony/Component/Process",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/Process.git",
-                "reference": "136cf0bdaacea81f779583376d47dd8aef4fc6ba"
+                "reference": "8a1ec96c4e519cee0fb971ea48a1eb7369dda54b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/Process/zipball/136cf0bdaacea81f779583376d47dd8aef4fc6ba",
-                "reference": "136cf0bdaacea81f779583376d47dd8aef4fc6ba",
+                "url": "https://api.github.com/repos/symfony/Process/zipball/8a1ec96c4e519cee0fb971ea48a1eb7369dda54b",
+                "reference": "8a1ec96c4e519cee0fb971ea48a1eb7369dda54b",
                 "shasum": ""
             },
             "require": {
@@ -265,7 +265,7 @@
             ],
             "description": "Symfony Process Component",
             "homepage": "http://symfony.com",
-            "time": "2014-08-31 03:22:04"
+            "time": "2014-09-23 05:25:11"
         }
     ],
     "packages-dev": [
@@ -683,18 +683,12 @@
             "time": "2014-08-31 03:22:04"
         }
     ],
-    "aliases": [
-
-    ],
+    "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [
-
-    ],
+    "stability-flags": [],
     "prefer-stable": false,
     "platform": {
         "php": ">=5.3.2"
     },
-    "platform-dev": [
-
-    ]
+    "platform-dev": []
 }