Add Markdown Preview

[cyberarm]

Add Markdown Preview when commenting on a post.

[steveklabnik]

Sweet! I'll merge this in when I get some time.

[steveklabnik]

This is done.

[cyberarm]

When answering a question I have no preview.

[PragTob]

Right now I can't see previews anywhere?!

[steveklabnik]

Well, apparently this needs re-opened.

[steveklabnik]

@cyberarm has to do that, I can't.

[PragTob]

? It is re-opened or am I missing something?

[steveklabnik]

@cyberarm has to do that, I can't.

[cyberarm]

"@cyberarm reopened the issue 4 months ago_"_

[steveklabnik]

I can't read. I blame 28 hours of plane rides.