fclose($file) exception.

It happens that fclose trigger an Exception because the resource is already closed.
After investigation, it seems that the $file get closed in the putObject function (l. 274) when the garbage collector clean the memory.
The change fix this issue.

Here is the related issue on the aws sdk repo: 
https://github.com/aws/aws-sdk-php/issues/929

spaces.php

@@ -289,7 +289,7 @@ class SpacesConnect {
          catch (\Exception $e) {
           $this->HandleAWSException($e);
          } finally {
-            if ($is_file) {
+            if (is_resource($file)) {
                 fclose($file);
             }
          }