use setImmediate everywhere.

lib/program.js

@@ -17,6 +17,8 @@ var Tput = require('./tput')
   , colors = require('./colors')
   , slice = Array.prototype.slice;
 
+var nextTick = global.setImmediate || process.nextTick.bind(process);
+
 /**
  * Program
  */
@@ -1283,7 +1285,7 @@ Program.prototype._buffer = function(text) {
 
   this._buf = text;
 
-  process.nextTick(this._flush);
+  nextTick(this._flush);
 };
 
 Program.prototype.flush = function(text) {

lib/widget.js

@@ -6496,7 +6496,7 @@ function Terminal(options) {
   });
 
   this.on('resize', function() {
-    setImmediate(function() {
+    nextTick(function() {
       self.term.resize(self.width - self.iwidth, self.height - self.iheight);
     });
   });