Update dependencies

Author: ddeboer

composer.json

@@ -16,15 +16,15 @@
     ],
     "require": {
         "php": ">=5.4",
-        "php-http/httplug": "^1.0@dev",
-        "php-http/discovery": "^0.4",
+        "php-http/httplug": "^1.0.0-beta",
+        "php-http/discovery": "~0.5",
         "guzzlehttp/guzzle": "^5.1"
     },
     "require-dev": {
         "ext-curl": "*",
         "guzzlehttp/ringphp": "^1.1",
         "php-http/adapter-integration-tests": "dev-master",
-        "php-http/utils": "^0.2"
+        "php-http/client-common": "^0.1"
     },
     "provide": {
         "php-http/client-implementation": "1.0"