Fix paths on Windows

Convert backslashes from filenames to forward slahses for permalinks
Wrap imported HTML in Liquid {% raw %} tags

Fixes posts that have Liquid-like markup
Add opts.skipComments to ignore comments

This option is not yet exposed on the command
line; you'll need to manually add the option to
the b2j.parse() call in blogger2jekyll.js.

http://blog.slaks.net/2013-05-31/migrating-from-blogger-to-jekyll/
Add wrapRaw option for Liquid {% raw %} tags
Merge pull request #7 from SLaks/master

Add Windows support, allow braces in HTML