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 +61,8 @@
         "phpunit/phpunit": "~4.1",
         "facebook/xhprof": "dev-master",
         "phpseclib/phpseclib": "~0.3.8",
-        "symfony/var-dumper": "~2.6.0"
+        "symfony/var-dumper": "~2.6.0",
+        "symfony/yaml": "~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": "ebfb19a21d438d1e168d0cc9c0db211c",
+    "hash": "1f60c1756d33943d2da85062b6d2c4d1",
     "packages": [
         {
             "name": "container-interop/container-interop",
@@ -2581,20 +2581,21 @@
         },
         {
             "name": "symfony/yaml",
-            "version": "v2.7.2",
+            "version": "v2.6.10",
+            "target-dir": "Symfony/Component/Yaml",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/Yaml.git",
-                "reference": "4bfbe0ed3909bfddd75b70c094391ec1f142f860"
+                "reference": "446353cc05339e676fb57e35232d2bfd055a47cd"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/Yaml/zipball/4bfbe0ed3909bfddd75b70c094391ec1f142f860",
-                "reference": "4bfbe0ed3909bfddd75b70c094391ec1f142f860",
+                "url": "https://api.github.com/repos/symfony/Yaml/zipball/446353cc05339e676fb57e35232d2bfd055a47cd",
+                "reference": "446353cc05339e676fb57e35232d2bfd055a47cd",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9"
+                "php": ">=5.3.3"
             },
             "require-dev": {
                 "symfony/phpunit-bridge": "~2.7"
@@ -2602,11 +2603,11 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.7-dev"
+                    "dev-master": "2.6-dev"
                 }
             },
             "autoload": {
-                "psr-4": {
+                "psr-0": {
                     "Symfony\\Component\\Yaml\\": ""
                 }
             },
@@ -2626,7 +2627,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2015-07-01 11:25:50"
+            "time": "2015-06-30 16:10:16"
         }
     ],
     "aliases": [],