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This user script is only a css file, however you can use it with the following js snippet.

// ==UserScript==
// @match        http://facebook.com/*
// @match        https://facebook.com/*
// @resource     customCSS https://sucs.org/~ripp_/UserScripts/facebook.com/newslayout.css
// @name         facebook.com/newslayout.css
// @downloadURL  https://sucs.org/~ripp_/UserScripts/facebook.com/newslayout.css.user.js
// @version      2016.04.14.06-0.2
// @description  Injects newslayout.css into facebook.com
// @author       ~ripp_
// @grant        GM_getResourceText
// ==/UserScript==
var s = document.createElement("style");
s.textContent = GM_getResourceText("customCSS").replace(/\s/g," ");
document.head.appendChild(s);

The css file it inserts is:

div#content {
    max-width: 100%;
}

div#globalContainer {
    max-width: 100%;
}

div#pagelet_sidebar {
    display: none;
}

div#globalContainer {
    padding-right: 0!important;
}

div#leftCol {
    float: none;
    width: 100%!important;
    padding: 0!important;
    margin: 0!important;
}

.sideNavItem {
    float: left;
    clear: none!important;
}

.navHeader {
    display: none;
}

div#sideNav::after {
    clear: left;
    display: block;
    content: "";
}

#contentCol {
    margin-left: 0!important;
}

div#rightCol {
    display: none;
}

div#contentArea {
    width: 100%!important;
}

._bui ._5afe .linkWrap {
    max-width: initial;
}

._55y4 ._bui .sideNavItem .hasCount {
    max-width: none!important;
}

._55y4 ._bui ._5afe {
    margin-left: 0px!important;
}

ul._bui.nonDroppableNav._3-96::after {
}

div#sideNav {
    background: white;
}

div#sideNav {
    padding: 5px;
    padding-left: 25px;
    margin-left: 12px;
}