composer: remove sabre/dav and guzzle

composer.json

@@ -20,7 +20,6 @@
         "clue/socket-raw": "~1.2",
         "clue/socks-react": "^0.8",
         "evenement/evenement": "^2",
-        "guzzlehttp/guzzle": "^5",
         "mkraemer/react-pcntl": "^3.0",
         "predis/predis": "^1.1",
         "psr/http-message": "^1",
@@ -30,8 +29,7 @@
         "react/http": "^0.8",
         "react/http-client": "^0.5",
         "react/socket": "^0.8",
-        "react/stream": "^0.7",
-        "sabre/dav": "^3.2.0"
+        "react/stream": "^0.7"
     },
     "require-dev": {
     }