Fix code style

Update dependencies - most notably Vapor to 2.4.2

Updates for Swift 4

Clear up create/store confusion

Returning an optional Post-instance is closer to what you'd expect when
calling a method that converts a preset request to a Post and then
stores it. Even if the callsite is more interested in the Post's id.

This does make the map call to gather newly created ids very unreadable.

The word 'create' was about the creation of an instance of the
Post-class, so using the word 'construct' prevents yet another possible
name clash with a Vapor Resource initializer's `create:` parameter.

Given the existence of a `create:` parameter in a Resource's
initializer, passing the instance method `create(_:)` to the initializer
parameter `store:` is very confusing, especially for people getting used
to the jargon of Vapor. This file is clearer now, but there's some
follow-up clarification to be done in the PostController's test cases.

Unified the name of Request parameters across the file

Add static key for the `content` property in the `Post` model

fix patch vs. put issue

Update to Vapor 2.0.5

Update to Vapor 2.0.4

consistent confusion resulting from droplet not available in routebui…

Update Config+Setup.swift

beta