Propagate _data folder from remote theme

README.md

@@ -47,3 +47,7 @@ For Enterprise GitHub, remote themes must be in the form of `http[s]://GITHUBHOS
 ## Debugging
 
 Adding `--verbose` to the `build` or `serve` command may provide additional information.
+
+## Catalogues
+
+In addition to the default directories `assets`, `_includes`, `_layouts`, and `_sass` also catalogues in the remote theme's `_data` directory are considered.  

lib/jekyll-remote-theme/theme.rb

@@ -63,6 +63,10 @@ def inspect
         " ref=\"#{git_ref}\" root=\"#{root}\">"
       end
 
+      def data_path
+        @data_path ||= File.join(@root, "_data")
+      end
+
       private
 
       def uri