libwebsocket_context: add userspace pointer for use before wsi creation

Signed-off-by: Alon Levy <alevy@redhat.com>
diff --git a/libwebsockets-api-doc.html b/libwebsockets-api-doc.html
index 18b1620..789871b 100644
--- a/libwebsockets-api-doc.html
+++ b/libwebsockets-api-doc.html
@@ -226,7 +226,8 @@
 <i>const char *</i> <b>ssl_private_key_filepath</b>,
 <i>int</i> <b>gid</b>,
 <i>int</i> <b>uid</b>,
-<i>unsigned int</i> <b>options</b>)
+<i>unsigned int</i> <b>options</b>,
+<i>void *</i> <b>user</b>)
 <h3>Arguments</h3>
 <dl>
 <dt><b>port</b>