I can't see Edge being used anywhere.

docs/api/core/Edge.html

-<h1>[name]</h1>
-
-<div class="desc">todo</div>
-
-
-<h2>Constructor</h2>
-
-<h3>[name]()</h3>
-
-
-<h2>Properties</h2>
-
-<h3>.[page:Vector3 todo]</h3>
-
-
-<h2>Methods</h2>
-
-<h3>.todo( [page:Vector3 todo] )</h3>
-<div>
-todo — todo<br />
-</div>
-
-
-<h2>Source</h2>
-
-<a href="https://github.com/mrdoob/three.js/blob/master/src/[path].js" target="_blank">src/[path].js</a>

docs/api/core/Edge.rst

-Edge - Edge between two vertices
---------------------------------
-
-.. rubric:: Constructor
-
-.. class:: Edge(v1, v2, vi1, vi2)
-
-    //todo:description
-
-    :param ? v1: //todo
-    :param ? v2: //todo
-    :param ? vi1: //todo
-    :param ? vi2: //todo
-
-.. rubric:: Attributes
-  
-.. attribute:: Edge.vertices
-
-    //todo:description
-
-.. attribute:: Edge.vertexIndices
-
-    //todo:description
-
-.. attribute:: Edge.faces
-
-    //todo:description
-
-.. attribute:: Edge.faceIndices
-
-    //todo:description

docs/index.html

@@ -114,7 +114,6 @@
 				"Core": [
 					{ name: "Clock", path: "core/Clock" },
 					{ name: "Color", path: "core/Color" },
-					{ name: "Edge", path: "core/Edge" },
 					{ name: "Face3", path: "core/Face3" },
 					{ name: "Face4", path: "core/Face4" },
 					{ name: "Frustum", path: "core/Frustum" },

src/core/Edge.js

-/**
- * @author alteredq / http://alteredqualia.com/
- * @author mikael emtinger / http://gomo.se/
- */
-
-THREE.Edge = function( v1, v2, vi1, vi2 ) {
-
-	this.vertices = [ v1, v2 ]; // vertex references
-	this.vertexIndices = [ vi1, vi2 ]; // vertex indices
-
-	this.faces = []; // face references
-	this.faceIndices = [];	// face indices
-
-};

utils/build.py

@@ -33,7 +33,6 @@ COMMON_FILES = [
 'core/UV.js',
 'core/Geometry.js',
 'core/Spline.js',
-'core/Edge.js',
 'cameras/Camera.js',
 'cameras/OrthographicCamera.js',
 'cameras/PerspectiveCamera.js',
@@ -315,7 +314,6 @@ WEBGL_FILES = [
 'core/UV.js',
 'core/Geometry.js',
 'core/Spline.js',
-'core/Edge.js',
 'cameras/Camera.js',
 'cameras/OrthographicCamera.js',
 'cameras/PerspectiveCamera.js',