Pull out route-handler callbacks

[douglascalhoun]

route-handler.js is a bit on the longer & messier side.

Consider pulling out the callback functions to individual routes into their own file, (i.e. routes.js)...

// route-handler.js
var routes = require('./routes');
app.get('/', routes.index);
app.get('/db/returning', routes.dbReturning);

// routes.js
module.exports = {
  index: function(){ ... },
  dbReturning: function(){ ... },
  ...
};