Support React v0.4 (while keeping BC with v0.3)

Fixes #1

Author: clue

.travis.yml

@@ -4,6 +4,6 @@ php:
   - 5.6
   - hhvm
 install:
-  - composer install --prefer-source --no-interaction
+  - composer update --prefer-source --no-interaction
 script:
   - phpunit --coverage-text

composer.json

@@ -15,8 +15,8 @@
     },
     "require": {
         "php": ">=5.3",
-        "react/event-loop": "~0.3.0",
+        "react/event-loop": "~0.3.0|~0.4.0",
         "clue/buzz-react": "~0.1.0",
-        "react/promise": "~1.0"
+        "react/promise": "~1.0|~2.0"
     }
 }

composer.lock

@@ -24,7 +24,13 @@ public function createClient($url = null)
 
         $connector = new UnixConnector($this->loop, $url);
 
-        $http = new HttpClient($this->loop, $connector, $connector);
+        $ref = new \ReflectionClass('React\HttpClient\Client');
+        if ($ref->getConstructor()->getNumberOfRequiredParameters() == 2) {
+            // react/http-client:0.4 removed the $loop parameter
+            $http = new HttpClient($connector, $connector);
+        } else {
+            $http = new HttpClient($this->loop, $connector, $connector);
+        }
 
         $sender = new Sender($http);