Updated the private stream close method to only call isPaused if it exists i.e. >= Node 0.12

Author: cjbj

lib/querystream.js

@@ -182,7 +182,14 @@ function close(callback) {
   // to allow _doneFetching to be emitted if needed.
   self._closed = true;
 
-  if (!self.isPaused()) {
+  // Node.js 0.10 didn't have an isPaused method that could be used to prevent
+  // an unnecessary pause event from being emitted (added in 0.11.14). We'll
+  // check for the existence of such a method and use it if possible, otherwise
+  // we'll just call pause. This could be simplified a little when support for
+  // Node.js 0.10 is dropped.
+  if (typeof self.isPaused === 'function' && !self.isPaused()) {
+    self.pause();
+  } else {
     self.pause();
   }