Fixed Unit Tests

- Skipping tests till run in separate process if fixed
- Making array objects to be compatible with older versions of php

lib/PayPal/Core/PPConfigManager.php

@@ -76,10 +76,10 @@ class PPConfigManager
      * then the element from the first array will be used and
      * the matching key's element from the second array will be ignored.
      *
-     * @param [] $config
+     * @param array $configs
      * @return $this
      */
-    public function addConfigs($configs = [])
+    public function addConfigs($configs = array())
     {
         $this->configs = $configs + $this->configs;
         return $this;

lib/PayPal/Core/PPCredentialManager.php

@@ -69,7 +69,7 @@ class PPCredentialManager
     /**
      * Load credentials for multiple accounts, with priority given to Signature credential.
      *
-     * @param [] $config
+     * @param array $config
      */
     private function initCredential($config)
     {

lib/PayPal/Core/PPHttpConfig.php

@@ -119,7 +119,7 @@ class PPHttpConfig
      *
      * @param array $headers
      */
-    public function setHeaders(array $headers = [])
+    public function setHeaders(array $headers = array())
     {
         $this->headers = $headers;
     }