Lists support

[zored]

I've installed j2m a long time ago but I don't understand how it handles Markdown lists.

Markdown:

# Hello
- World `here`.
  + And here.
  + And here.
- World `here`.

Jira:

h1. Hello
- World {{here}}.
  + And here.
  + And here.
- World {{here}}.

Could you give an advice or tell where to start in code with my pull request? 😄