updated composer by PSR-0 convention

Added classmap to bypass PSR-0 standard issue with underscores (_) - by PSR-0 underscores are translated into directory separators (slashes: /) whereas previous naming of files x_y_z will throw an exception.

Author: idabic

composer.json

@@ -14,9 +14,14 @@
     },
     "autoload": {
         "psr-0": {
-            "MaxCDN\\": "src/",
-            "": "src/"
-        }
+            "MaxCDN\\": "src/"
+        },
+        "classmap": [
+            "src/MaxCDN.php",
+            "src/MaxCDN/OAuth/OAuthSignatureMethod_PLAINTEXT.php",
+            "src/MaxCDN/OAuth/OAuthSignatureMethod_HMAC_SHA1.php",
+            "src/MaxCDN/OAuth/OAuthSignatureMethod_RSA_SHA1.php"
+        ]
     }
 
 }