fix(google-maps): the zoom option is missing in the GoogleMapOptions class (#1948)

* Update index.ts

* Update index.ts

* Add missing features, and bug fix of methods

* update: classname must be in pascal case

* remove: duplicated class definition

* export encode and spherical static classes

* Add comma

* Fix Encoding and Spherical

* Add convenience methods

* Fix decorators for Encoding and Spherical

* Update: getMap() methods return the instance of the wrapper plugin

* Update: getMap() methods return the instance of the wrapper plugin

* Remove `@CordovaInstance` decorators from getMap()

* Update: GoogleMapOptions (all fields are not optional).

* Follow up:  version `2.0.0-beta2-20170719-2226` of cordova-plugin-googlemaps

* Fix: tslint error

* Fix: tslint error

* No more isAvailable() method.

* Bug fix: description is incorrect

* Bug fix: example code was wrong.

* Bug fix: HtmlInfoWindow does not work
https://github.com/ionic-team/ionic-native/pull/1815#issuecomment-318909795

* Bug fix: HtmlInfoWindow does not work

* Bug fix: HtmlInfoWindow does not work

* Bug fix: HtmlInfoWindow does not work

* Bug fix: HtmlInfoWindow does not work

* It seems the ionViewDidLoad() is enough delayed after platform.ready()

* Bug fix: map.setDiv()

* Bug fix: HtmlInfoWindow does not work

* Bug fix: BaseArrayClass definition is incorrect

* Bug fix: BaseArrayClass constructor is wrong

* Bug fix: Geocoder class does not work

* Bug fix: LatLngBounds constructor is wrong

* update: noNotify option is not declared

* Bug fix: Geocoder.geocode() returns array of GeocoderResult

* Update: clarify acceptable parameters of BaseArrayClass

* Add: AnimateCameraOption.padding is missing

* Revert: BaseClass.empty() method does not have the noNotify option

* Add `destruct` option to the CordovaOption.

- This allows BaseClass.on() is able to pass multiple retuned values from the cordova plugin side to the event lister.

* A semicolon is mixing

* update: event names

* Update: BaseClass.addEventListener(), addEventListenerOnce(), on(), and one()

* Add: destruct option for otherPromise
Change: inside event names (must use the version 2.0.0-beta3-20170808-1950 or higher)

* Build for working group

* Bug fix: map.getCameraTarget() definition is incorrect

* Bug fix: The definition of VisibleRegion interface is incorrect

* Fix: LatLng, LatLngBounds, and PolylineOptions classes
Update: map.getVisibleRegion()

Add: VisibleRegion class

* Bug fix: the definition of map.clear() method is incorrect

* Fix: map.fromLatLngToPoint()

* Ignore the dist directory on the master branch

* Remove the dist folder on the master branch

* fixes and tweaks

* use union types for CameraPosition

fixes issue mentioned on slack by @wf9a5m75

* fix types

* update AnimateCameraOptions interface

* remove AnimateCameraOptions interface

* add MarkerCluster class

* Bug fix: Can not create an instance of BaseArrayClass

* Bug fix: the icons property of MarkerClusterOptions

* Bug fix: the zoom option is missing

https://github.com/mapsplugin/cordova-plugin-googlemaps/issues/1712

* Update index.ts

src/@ionic-native/plugins/google-maps/index.ts

@@ -116,6 +116,11 @@ export interface GoogleMapOptions {
      * Turns the map toolbar on or off. This option is for Android only.
      */
     mapToolbar?: boolean;
+
+    /**
+     * Turns the zoom controller on or off. This option is for Android only.
+     */
+    zoom?: boolean;
   };
 
   gestures?: {