Adding installation instructions for contributors

Author: jamiehannaford

README.md

@@ -40,6 +40,16 @@ require 'vendor/autoload.php';
 
 And you're ready to go!
 
+Alternatively, if you would like to clone the repository into a directory (to work and submit pull requests):
+
+```bash
+git clone [email protected]:rackspace/php-opencloud.git .
+curl -sS https://getcomposer.org/installer | php
+php composer.phar install
+```
+
+You can specify the `--no-dev` flag to Composer if you do not want to install phpDocumentor (lots of vendor folders).
+
 Support and Feedback
 --------------------
 Your feedback is appreciated! If you have specific problems or bugs with this SDK, please file an issue on Github. We

lib/OpenCloud/Common/Http/Message/RequestSubscriber.php

@@ -39,8 +39,9 @@ public static function getSubscribedEvents()
      */
     public function doCurlProgress($options)
     {
-    	if ($options['request']->getCurlOptions()->hasKey('progressCallback')) {
-	    	return call_user_func($options['request']->getCurlOptions()->get('progressCallback'));
+        $curlOptions = $options['request']->getCurlOptions();
+    	if ($curlOptions->hasKey('progressCallback')) {
+	    	return call_user_func($curlOptions->get('progressCallback'));
     	} else {
 	    	echo sprintf(
 	    		"Download size: [%d]\nDownloaded: [%d]\nUpload size: [%d]\nUploaded: [%d]\n",