create post route

If you go ahead and switch the implementation to use this style, you'll have a grasp of [map](http://en.wikipedia.org/wiki/Map_%28higher-order_function%29) and [reduce (dunno why wikipedia prefers 'fold'](http://en.wikipedia.org/wiki/Fold_%28higher-order_function%29) These are much bigger concepts than their availability as simple functions in lodash would suggest. Together they represent the [prevailing paradigm](http://en.wikipedia.org/wiki/MapReduce) for burning collections of data down into single meaningful results. In this example, though, the simple advantage is that the `_.reduce...` solution gives you a much more extensible url building function, resulting in much more maintainable code.