Build: Drop testing on jsdom with Node 0.10 & 0.12

Fixes gh-2841

Gruntfile.js

@@ -15,17 +15,9 @@ module.exports = function( grunt ) {
 	var fs = require( "fs" ),
 		gzip = require( "gzip-js" ),
 		srcHintOptions = readOptionalJSON( "src/.jshintrc" ),
-		newNode = !/^v0/.test( process.version ),
 
-		// Allow to skip jsdom-related tests in Node.js < 1.0.0
-		runJsdomTests = newNode || ( function() {
-			try {
-				require( "jsdom" );
-				return true;
-			} catch ( e ) {
-				return false;
-			}
-		} )();
+		// Skip jsdom-related tests in Node.js 0.10 & 0.12
+		runJsdomTests = !/^v0/.test( process.version );
 
 	if ( !grunt.option( "filename" ) ) {
 		grunt.option( "filename", "jquery.js" );

build/tasks/install_old_jsdom.js

@@ -1,20 +0,0 @@
-module.exports = function( grunt ) {
-
-	"use strict";
-
-	// Run this task to run jsdom-related tests on Node.js < 1.0.0.
-	grunt.registerTask( "old_jsdom", function() {
-		if ( !/^v0/.test( process.version ) ) {
-			console.warn( "The old_jsdom task doesn\'t need to be run in io.js or new Node.js" );
-			return;
-		}
-
-		// Use npm on the command-line
-		// There is no local npm
-		grunt.util.spawn( {
-			cmd: "npm",
-			args: [ "install", "jsdom@3" ],
-			opts: { stdio: "inherit" }
-		}, this.async() );
-	} );
-};