Fixing a couple of issues I found in MRB when using as basis for actual project

1) I found that having bootstrap.css in the css\libs directory caused bootstrap icons to no longer work, since in bootstrap.css, background images are supposed to be in an `img` directory one level up, like so: `background-image: url("../img/glyphicons-halflings.png");`.  I suspect that other libraries' css files may have similar requirements, so I deleted the libs directory and moved the css files up into a single css directory.  Icons now work.

2) When making AJAX POST requests, I noticed that the body of my requests were not available in `req.body` as I expected.  This was because server.js needed this line of configuration: `server.use(express.bodyParser())` as described [here](http://stackoverflow.com/questions/5710358/how-to-get-post-query-in-express-node-js).  

I will be adding these changes to Marionette-Require-Boilerplate accordingly. 

Note: this is my first pull request - is it improper for me to be using my own master branch?  Just wondering.  I assume you can merge my changes in to whichever branch you like.