[BUGFIX] This need to be a LinkedHashMap to keep the order of handlers.

Hi,

After updating java on my server, the browser was unable to load standalone/config.js on Dynmap-Multiserver. This was due to the handlers having a different order when receiving the request (in HTTPServerHandler) than when we populated the map (in HTTPServerInitializer).

To keep the order of the handlers, we have to use a LinkedHashMap.

Lorgan