Update minimum PHP in composer to 5.4

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": ">=5.3.0",
+        "php": ">=5.4.0",
         "psr/http-message": "dev-master"
     },
     "require-dev": {
@@ -21,6 +21,7 @@
         "pjdietz/shamserver": "dev-master"
     },
     "autoload": {
+        "psr-4": { "WellRESTed\\" : "src/" },
         "psr-0": { "pjdietz\\WellRESTed": "src/" },
         "classmap": ["src/pjdietz/WellRESTed/Exceptions/HttpExceptions.php"]
     }

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "ae063f8a64fd980e12ddf9a21845262d",
+    "hash": "f930585c844657171ce2093bc185cd20",
     "packages": [
         {
             "name": "psr/http-message",
@@ -1117,7 +1117,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=5.3.0"
+        "php": ">=5.4.0"
     },
     "platform-dev": []
 }