Update references to 0.3, update lock file

Author: igorw

composer.json

@@ -7,15 +7,15 @@
         "php": ">=5.3.3",
         "guzzle/http": "3.0.*",
         "guzzle/parser": "3.0.*",
-        "react/socket": "0.2.*"
+        "react/socket": "0.3.*"
     },
     "autoload": {
         "psr-0": { "React\\Http": "" }
     },
     "target-dir": "React/Http",
     "extra": {
         "branch-alias": {
-            "dev-master": "0.2-dev"
+            "dev-master": "0.3-dev"
         }
     }
 }