remove appveyor usage

appveyor.yml

@@ -1,59 +0,0 @@
-# appveyor.yml reference : http://www.appveyor.com/docs/appveyor-yml
-# and https://github.com/unicorn-engine/unicorn/blob/master/.appveyor.yml
-
-version: "{build}"
-
-skip_tags: true
-
-branches:
-  only:
-    - master
-
-environment:
-  GOPATH: c:\gopath
-  CYG_MIRROR: http://cygwin.mirror.constant.com
-  CYG_PACKAGES: make
-  matrix:
-  - APPVEYOR_BUILD_SYS: Cygwin
-    CYG_ROOT: C:\cygwin64
-    CYG_CACHE: C:\cygwin64\var\cache\setup
-    CYG_SETUP: setup-x86_64.exe
-    BASH: C:\cygwin64\bin\bash
-  # - APPVEYOR_BUILD_SYS: Cygwin
-  #   CYG_ROOT: C:\cygwin
-  #   CYG_CACHE: C:\cygwin\var\cache\setup
-  #   CYG_SETUP: setup-x86.exe
-  #   BASH: C:\cygwin\bin\bash
-
-init:
-  # Carriage returns are bad
-  - cmd:
-      'git config --global core.autocrlf input'
-
-# Cache Cygwin files to speed up build
-cache:
-    - '%CYG_CACHE%'
-
-clone_folder: c:\gopath\src\github.com\hashicorp\packer
-
-# Install needed build dependencies
-install:
-  - curl -fsS -o %CYG_SETUP% "https://cygwin.com/%CYG_SETUP%"
-  - '%CYG_SETUP% --quiet-mode --no-shortcuts --only-site --root "%CYG_ROOT%" --site "%CYG_MIRROR%" --local-package-dir "%CYG_CACHE%" --packages "%CYG_PACKAGES%" --upgrade-also'
-  - echo %Path%
-  - go version
-  - go env
-
-build_script:
-  - git rev-parse HEAD
-  - '%BASH% -lc "pwd"'
-  - '%BASH% -lc "cd $APPVEYOR_BUILD_FOLDER"'
-  - '%BASH% -lc "pwd"'
-  - '%BASH% -lc "cat Makefile"'
-  - '%BASH% -lc "make --version"'
-  - '%BASH% -lc "make deps"'
-
-test_script:
-  - '%BASH% -lc "make ci"'
-
-deploy: off