Set "no_intra_emphasis" option for markdown

Thanks for [the article on Middleman & Bower](http://fearmediocrity.co.uk/2014/01/25/using_bower_with_middleman/). I noticed that you have weird italics in this paragraph:

> However, depending on your setup, this may not play well with other Middleman components, such as asset_hash. We can avoid this problem by not amending the sprockets path until other components have been initialised. We do this by wrapping the line above in after_configuration, like so:

I think this would fix that problem.