Bump min version req to 5.3.9 to avoid Interface parse error

.travis.yml

@@ -1,7 +1,7 @@
 language: php
 
 php:
-  - 5.3.3
+  - 5.3.9
   - 5.3
   - 5.4
 

composer.json

@@ -25,7 +25,7 @@
         }
     }
   , "require": {
-        "php": ">=5.3.3"
+        "php": ">=5.3.9"
       , "react/socket": "0.2.*"
       , "guzzle/http": "~3.0"
       , "symfony/http-foundation": "~2.1"