Add appveyor support (#157)
Add appveyor support (#157)

* Adding appveyor support.

Deren-Liao/google-cloud-visualstudio,GoogleCloudPlatform/google-cloud-visualstudio,GoogleCloudPlatform/google-cloud-visualstudio,Deren-Liao/google-cloud-visualstudio,ILMTitan/google-cloud-visualstudio,ILMTitan/google-cloud-visualstudio,ivannaranjo/google-cloud-visualstudio,GoogleCloudPlatform/google-cloud-visualstudio,GoogleCloudPlatform/google-cloud-visualstudio,ILMTitan/google-cloud-visualstudio,ivannaranjo/google-cloud-visualstudio,ILMTitan/google-cloud-visualstudio,ILMTitan/google-cloud-visualstudio,ivannaranjo/google-cloud-visualstudio,Deren-Liao/google-cloud-visualstudio,GoogleCloudPlatform/google-cloud-visualstudio