Add support for the node net module.

frog/lib/node/os.dart

+// module os
+
+#library('os');
+#import('node.dart');
+#import('nodeimpl.dart');
+
+class Os {
+  var _os;
+  Os(this._os);
+  String hostname() native "return this._os.hostname();";
+  String type() native "return this._os.type();";
+  String platform() native "return this._os.platform();";
+  String arch() native "return this._os.arch();";
+  String release() native "return this._os.release();";
+  int uptime() native "return this._os.uptime();";
+  List<double> loadAvg() => new NativeListPrimitiveElement<double>(_loadavg());
+  var _loadavg() native "return this._os.loadavg();";
+  int totalmem() native "return this._os.totalmem();";
+  int freemem() native "return this._os.freemem();";
+  List<OsCpu> cpus() => new _NativeList<OsCpu>(_cpus(),
+    (cpu) => new OsCpu(cpu));
+  var _cpus() native "return this._os.cpus()";
+  Map<String, List<OsNetworkInterface>> networkInterfaces() =>
+      new NativeMap<List<OsNetworkInterface>>(_netInts(),
+        (var netIntList) => new NativeList<OsNetworkInterface>(netIntList,
+          (var netInt) => new OsNetworkInterface(netInt)));
+  var _netInts() native "return this._os.networkInterfaces();";
+}
+
+Os get os() => new Os(require('os'));
+
+class OsLoadAvg {
+  var _loadavg;
+  OsLoadAvg(this._loadavg);
+  int get length() native "return this._loadavg.length;";
+  double operator[](int index) native "return this._loadavg[index];";
+}
+
+class OsCpu {
+  var _cpu;
+  OsCpu(this._cpu);
+  String get model() native "return this._cpu.model;";
+  int get speed() native "return this._cpu.speed;";
+  OsCpuTimes get times() => new OsCpuTimes(_times());
+  var _times() native "return this._cpu.times;";
+}
+
+class OsCpuTimes {
+  var _times;
+  OsCpuTimes(this._times);
+  int get user() native "return this._times.user;";
+  int get nice() native "return this._times.nice;";
+  int get sys() native "return this._times.sys;";
+  int get idle() native "return this._times.idle;";
+  int get irq() native "return this._times.irq;";
+}
+
+class OsNetworkInterface {
+  var _netInt;
+  OsNetworkInterface(this._netInt);
+  String get address() native "return this._netInt.address;";
+  String get family() native "return this._netInt.family;";
+  bool get internal() native "return this._netInt.internal;";
+}