upgrade to guzzle 5

Author: Keith Kirk

composer.json

@@ -18,8 +18,8 @@
     ],
     "require": {
         "php":                        "~5.4",
-        "guzzlehttp/guzzle":          "~4.0",
-        "guzzlehttp/guzzle-services": "~0.3",
+        "guzzlehttp/guzzle":          "~5.0",
+        "guzzlehttp/guzzle-services": "~0.5",
         "monolog/monolog":            "~1.7",
         "symfony/filesystem":         "~2.5",
         "symfony/console":            "~2.5"