yelp-build epub fails if you input a file name with a white space in the path
If you run yelp-build epub "$FILENAME"
with "$FILENAME" having a space in the path, yelp-build fails with error: cd too many arguments and warning: failed to load external entity.
$ yelp-build epub "./some path/index.page"
yelp-build: line 158: cd: too many arguments
warning: failed to load external entity "file:///index.page"