Remove newline fix, as this is not needed with Markdown processing.

We can remove wpautop() processing for these post types as well,
since we'll be storing full HTML content inside post_content. But,
wpautop() will mostly leave alone full HTML, so we can just wait
until there is an edge case.
Merge pull request #19 from nacin/remove-fix-newlines

Remove newline fix, as this is not needed with Markdown processing