CI on Windows

appveyor.yml

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+version: "{build}"
+
+os: Windows Server 2012
+
+clone_folder: c:\projects\vim-ci
+
+before_build:
+  - '"C:\\Program Files\\Microsoft SDKs\\Windows\\v7.1\\Bin\\SetEnv.cmd" /x64'
+  - set INCLUDE=%INCLUDE%;"C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.1A\\Include"
+  - git submodule init
+  - git submodule update
+
+build_script:
+  - 'cd vim/src && "C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\VC\\bin\\nmake" -f Make_mvc.mak CPU=AMD64 GUI=yes IME=yes MBYTE=yes ICONV=yes DEBUG=no'
+