* extended staticmap capabilities
* added allowRemoteMarkerIcons configuration option and restricted fetching of remote marker icons only when option is set to true;
asynchronously load all available icons in a settings object on server startup;
replaced fs.existsSync() call in serve_rendered when drawing marker icons with a check against available icons settings object;
* updated documentation for linecap parameter in staticmaps endpoint;
added linejoin parameter to staticmaps endpoint;
* added capability of staticmap endpoint to draw multiple paths
https://github.com/klokantech/tileserver-gl/issues/274
Clean up wmts template with correct syntax
Update endpoint URL and change content type
After a good nights sleep I considered the structure of the endpoint link for WMTS, at the same time I cleaned up the code and added the correct content type for the response.
