remove appveyor

Signed-off-by: Matthew Fisher <matt.fisher@microsoft.com>

.appveyor.yml

@@ -1,20 +0,0 @@
-version: "{build}"
-branches:
-  only:
-  - master
-clone_folder: c:\go\src\k8s.io\helm
-environment:
-  GOPATH: c:\go
-  PATH: c:\ProgramData\bin;$(PATH)
-install:
-  - ps: iex ((New-Object System.Net.WebClient).DownloadString('https://raw.githubusercontent.com/fishworks/gofish/master/scripts/install.ps1'))
-  - gofish init
-  - gofish install glide
-  - glide install --strip-vendor
-cache:
-  - vendor -> glide.lock
-build: "off"
-deploy: "off"
-test_script:
-  - go build .\cmd\...
-  - go test .\...