Add a blog.prefix option to make setting all the path options easier
Add a blog.prefix option to make setting all the path options easier

MinasMazar/middleman-blog,LessEverything/middleman-blog,fukayatsu/middleman-blog,middleman/middleman-blog,dhulihan/middleman-blog,middleman/middleman-blog,5t111111/middleman-blog,sahat/middleman-blog,dhulihan/middleman-blog,sahat/middleman-blog,evaryont/middleman-blog,fukayatsu/middleman-blog,sahat/middleman-blog,fukayatsu/middleman-blog,MinasMazar/middleman-blog,dhulihan/middleman-blog,5t111111/middleman-blog,5t111111/middleman-blog,evaryont/middleman-blog,evaryont/middleman-blog,MinasMazar/middleman-blog,middleman/middleman-blog,LessEverything/middleman-blog