message: fix(jekyll): Clean up flag names
  BREAKING CHANGE: The flags went from `--jksrc` to `--source` and
  `--jkdst` to `--destination`.
diff: @@ -99,14 +99,14 @@ fn run() -> Result<()> {
  .subcommand(SubCommand::with_name("list-syntaxes").about("list supported syntaxes"))
  .subcommand(SubCommand::with_name("convert-jekyll")
  .about("convert jekyll website to cobalt")
  - .arg(Arg::with_name("jksrc")
  - .long("jksrc")
  + .arg(Arg::with_name("source")
  + .long("source")
  .value_name("JEKYLL-FILE-OR-DIR")
  .help("Jekyll posts' directory")
  .required(true)
  .takes_value(true))
  - .arg(Arg::with_name("jkdst")
  - .long("jkdst")
  + .arg(Arg::with_name("destination")
  + .long("destination")
  .value_name("DIR")
  .help("Output dir of converted posts")
  .takes_value(true)
  @@ -143,8 +143,8 @@ fn run() -> Result<()> {
  Ok(())
  }
  "convert-jekyll" => {
  - let source = matches.value_of("jksrc").unwrap().to_string();
  - let dest = matches.value_of("jkdst").unwrap().to_string();
  + let source = matches.value_of("source").unwrap().to_string();
  + let dest = matches.value_of("destination").unwrap().to_string();
  jekyll::jk_document::convert_from_jk(std::path::Path::new(&source),
  std::path::Path::new(&dest))
  .chain_err(|| "Jekyll conversion failed.")
  