add site documentation for HTTP header authentication

Joel Johnson

2015-06-29 0b298b78a7c1fcda7f799af0c045a6c2e829a6bf

 src/main/java/com/gitblit/transport/ssh/UsernamePasswordAuthenticator.java

@@ -51,7 +51,7 @@
      }

      username = username.toLowerCase(Locale.US);
      UserModel user = authManager.authenticate(username, password.toCharArray());
      UserModel user = authManager.authenticate(username, password.toCharArray(), null);
      if (user != null) {
         client.setUser(user);
         return true;