Remove node v0.8 support

Nobody should be using node v0.8 at this point, and if they choose to
anyway, they can use older ncp versions.

lib/ncp.js

@@ -1,8 +1,6 @@
 var fs = require('fs'),
     path = require('path');
 
-const modern = /^v0\.1\d\.\d+/.test(process.version);
-
 module.exports = ncp;
 ncp.ncp = ncp;
 
@@ -24,8 +22,6 @@ function ncp (source, dest, options, callback) {
       modified = options.modified,
       dereference = options.dereference,
       errs = null,
-      eventName = modern ? 'finish' : 'close',
-      defer = modern ? setImmediate : process.nextTick,
       started = 0,
       finished = 0,
       running = 0,
@@ -55,7 +51,7 @@ function ncp (source, dest, options, callback) {
   function getStats(source) {
     var stat = dereference ? fs.stat : fs.lstat;
     if (running >= limit) {
-      return defer(function () {
+      return setImmediate(function () {
         getStats(source);
       });
     }
@@ -128,7 +124,7 @@ function ncp (source, dest, options, callback) {
         readStream.pipe(writeStream);
       });
     }
-    writeStream.once(eventName, function() {
+    writeStream.once('finish', function() {
         if (modified) {
             //target file modified date sync.
             fs.utimesSync(target, file.atime, file.mtime);