Force requiring a version 2.6.* of Symfony packages because the 2.7.* versions...

Force requiring a version 2.6.* of Symfony packages because the 2.7.* versions require PHP >= 5.3.9 (we support PHP 5.3.3)

composer.json

@@ -61,7 +61,7 @@
         "phpunit/phpunit": "~4.1",
         "facebook/xhprof": "dev-master",
         "phpseclib/phpseclib": "~0.3.8",
-        "symfony/var-dumper": "~2.6"
+        "symfony/var-dumper": "~2.6.0"
     },
     "repositories": [
         {

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "5ca7792e3260d95666c5c6cf9e97a9db",
+    "hash": "ebfb19a21d438d1e168d0cc9c0db211c",
     "packages": [
         {
             "name": "container-interop/container-interop",
@@ -2521,20 +2521,21 @@
         },
         {
             "name": "symfony/var-dumper",
-            "version": "v2.7.2",
+            "version": "v2.6.10",
+            "target-dir": "Symfony/Component/VarDumper",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/var-dumper.git",
-                "reference": "fde603d9f4b2418ff0f0315b93eb039c9aa41205"
+                "reference": "5fba957a30161d8724aade093593cd22f815bea2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/fde603d9f4b2418ff0f0315b93eb039c9aa41205",
-                "reference": "fde603d9f4b2418ff0f0315b93eb039c9aa41205",
+                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/5fba957a30161d8724aade093593cd22f815bea2",
+                "reference": "5fba957a30161d8724aade093593cd22f815bea2",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9"
+                "php": ">=5.3.3"
             },
             "require-dev": {
                 "symfony/phpunit-bridge": "~2.7"
@@ -2545,14 +2546,14 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.7-dev"
+                    "dev-master": "2.6-dev"
                 }
             },
             "autoload": {
                 "files": [
                     "Resources/functions/dump.php"
                 ],
-                "psr-4": {
+                "psr-0": {
                     "Symfony\\Component\\VarDumper\\": ""
                 }
             },
@@ -2576,7 +2577,7 @@
                 "debug",
                 "dump"
             ],
-            "time": "2015-07-01 12:07:40"
+            "time": "2015-07-01 10:03:42"
         },
         {
             "name": "symfony/yaml",