code: function getRouteType (route) {
    var match = route.match(/\:(post|page|tag|category)\b/);
    if (match && match.length > 1)
      return match[1];
    return null;
  }
docs: Takes a `route` (ex: '/posts/:post') and returns
  the name of the parameter (ex: 'post'), which should be a route type
  
  @params {String} route
  @returns {String}