rename ext/fspath/mac/finder_label_number.{c,m}
separate url_for_path into get_url and get_path
simplify going to project root in spec_helper for auto compiling ext
test that move_to_trash really moves file to trash
implement move_to_trash using NSWorkspace#performFileOperation:NSWorkspaceRecycleOperation
rename ext/fspath/mac/{finder_label_number,ext}.m
restore move_to_trash in rb as empty placeholder for documentation