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? 😄

[FokkeZB]

Looking at https://jira.atlassian.com/secure/WikiRendererHelpAction.jspa?section=lists I think the JIRA conversion should be:

h1. Hello
* World {{here}}.
** And here.
** And here.
* World {{here}}.

A PR is very welcome!