Replace Q by when

Q's new version as a different support of progress. when keeps
progress like it is suposed to be.

lib/extractFull.js

@@ -1,6 +1,6 @@
 'use strict';
 var path = require('path');
-var Q = require('q');
+var when = require('when');
 var u = {
   run: require('../util/run'),
   switches : require('../util/switches')
@@ -12,8 +12,8 @@ var u = {
  * @progress {array} Extracted files and directories.
  * @reject {Error} The error as issued by 7-Zip.
  */
-module.exports = function (archive, dest, options, cb) {
-  return Q.Promise(function (fulfill, reject, progress) {
+module.exports = function (archive, dest, options) {
+  return when.promise(function (fulfill, reject, progress) {
 
     if (options === undefined) {
       options = {};
@@ -44,5 +44,5 @@ module.exports = function (archive, dest, options, cb) {
       reject(err);
     });
 
-  }).nodeify(cb);
+  })
 };

package.json

@@ -26,6 +26,7 @@
   "homepage": "http://quentinrossetti.github.io/node-7zip",
   "dependencies": {
     "q": "^2.0.2",
+    "when": "^3.4.4",
     "win-spawn": "^2.0.0"
   },
   "devDependencies": {

test/util/run.js

@@ -28,11 +28,4 @@ describe('Util: `run`', function () {
     });
   });
 
-  it('should work as Node.js-style callback', function (done) {
-    run(0, function (err) {
-      expect(err.message).to.be.a('string');
-      done();
-    });
-  });
-
 });

util/run.js

@@ -1,7 +1,7 @@
 'use strict';
 var os    = require('os');
 var spawn = require('win-spawn');
-var Q     = require('q');
+var when  = require('when');
 
 /**
  * @promise Run
@@ -10,8 +10,8 @@ var Q     = require('q');
  * @reject {Error} The error issued by 7-Zip.
  * @reject {number} Exit code issued by 7-Zip.
  */
-module.exports = function (command, cb) {
-  return Q.Promise(function (fulfill, reject, progress) {
+module.exports = function (command) {
+  return when.promise(function (fulfill, reject, progress) {
 
     // Parse the command variable. If the command is not a string reject the 
     // Promise. Otherwise transform the command into two variables: the command
@@ -41,5 +41,5 @@ module.exports = function (command, cb) {
       reject(err, code);
     });
 
-  }).nodeify(cb);
+  });
 };