Your robots.txt is nothing but comments. It doesn't specify the URL of your sitemap. It does have a blanket disallow for all user agents for the root of your site. It is commented out (like everything else) but if that was ever uncommented that could be your problem.

I guessed your sitemap URL since it isn't in your robots.txt. You have every single page listed as being updated hourly. Even if that is true I wouldn't put that in there.