Add options for pause() (#191)

* Avoid passing device_id in body parameters
* Add device_id to pause

src/spotify-web-api.js

@@ -1076,7 +1076,7 @@ SpotifyWebApi.prototype = {
 
   /**
    * Starts o Resumes the Current User's Playback
-   * @param {Object} [options] Options, being context_uri, offset, uris.
+   * @param {Object} [options] Options, being device_id, context_uri, offset, uris.
    * @param {requestCallback} [callback] Optional callback method to be called instead of the promise.
    * @example playbackResume({context_uri: 'spotify:album:5ht7ItJgpBH7W6vJ5BqpPr'}).then(...)
    * @returns {Promise|undefined} A promise that if successful, resolves into a paging object of tracks,
@@ -1103,14 +1103,17 @@ SpotifyWebApi.prototype = {
 
   /**
    * Pauses the Current User's Playback
+   * @param {Object} [options] Options, for now device_id,
    * @param {requestCallback} [callback] Optional callback method to be called instead of the promise.
    * @example playbackPause().then(...)
    * @returns {Promise|undefined} A promise that if successful, resolves into a paging object of tracks,
    *          otherwise an error. Not returned if a callback is given.
    */
-  pause: function(callback) {
+  pause: function(options, callback) {
     return WebApiRequest.builder(this.getAccessToken())
       .withPath('/v1/me/player/pause')
+      /*jshint camelcase: false */
+      .withQueryParameters(options && options.device_id ? {device_id: options.device_id} : null)
       .withHeaders({ 'Content-Type' : 'application/json' })
       .build()
       .execute(HttpManager.put, callback);

test/spotify-web-api.js

@@ -1412,6 +1412,31 @@ describe('Spotify Web API', function() {
 
   });
 
+  it('should pause the user\'s playback with options', function(done) {
+
+    sinon.stub(HttpManager, '_makeRequest', function(method, options, uri, callback) {
+      method.should.equal(superagent.put);
+      uri.should.equal('https://api.spotify.com/v1/me/player/pause');
+      options.query.should.eql({device_id: 'my_device_id'});
+      callback();
+    });
+
+    var accessToken = 'myAccessToken';
+
+    var api = new SpotifyWebApi({
+      accessToken : accessToken
+    });
+
+    api.pause({device_id: 'my_device_id'})
+      .then(function(data) {
+        done();
+      }, function(err) {
+        console.log(err);
+        done(err);
+      });
+
+  });
+
   it('should skip the user\'s playback to next track', function(done) {
 
     sinon.stub(HttpManager, '_makeRequest', function(method, options, uri, callback) {