message: Use the system dependent path separator
diff: use std::fs::{self, File};
  use std::collections::HashMap;
  use std::io::Write;
  -use std::path::Path;
  +use std::path::{self, Path};
  use std::ffi::OsStr;
  use liquid::Value;
  use walkdir::{WalkDir, DirEntry, WalkDirIterator};
  @@ -188,7 +188,7 @@ pub fn build(config: &Config) -> Result<()> {
  } else {
  try!(entry_path.split(source_str)
  .last()
  - .map(|s| s.trim_left_matches("/"))
  + .map(|s| s.trim_left_matches(path::MAIN_SEPARATOR))
  .ok_or("Empty path"))
  };
  