Fixed sorting of listen addresses so that wildcard address is always at
the end (closes #187).  Failure to do so could result in several listen
sockets to be created instead of only one listening on wildcard address.

Reported by Roman Odaisky.

src/http/ngx_http.c

diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
index 3e077fb..f1f8a48 100644
--- a/src/http/ngx_http.c
+++ b/src/http/ngx_http.c
@@ -1613,6 +1613,11 @@
         return 1;
     }
 
+    if (second->opt.wildcard) {
+        /* a wildcard address must be the last resort, shift it to the end */
+        return -1;
+    }
+
     if (first->opt.bind && !second->opt.bind) {
         /* shift explicit bind()ed addresses to the start */
         return -1;