add provider based region support

Author: hgiasac

shared/utils.js

@@ -8,6 +8,7 @@ module.exports = {
     this.options.stage = _.get(this, 'options.stage')
       || 'dev';
     this.options.region = _.get(this, 'options.region')
+      || _.get(this, 'serverless.service.provider.region')
       || 'us-central1';
 
     return BbPromise.resolve();

shared/utils.test.js

@@ -31,5 +31,17 @@ describe('Utils', () => {
         expect(googleCommand.options.region).toEqual('my-region');
       });
     });
+
+
+    it('should set the provider values for stage and region if provided', () => {
+      googleCommand.serverless.service.provider = {
+        region: 'my-region',
+      };
+
+      return googleCommand.setDefaults().then(() => {
+        expect(googleCommand.options.region).toEqual('my-region');
+      });
+    });
+
   });
 });