Add AppVeyor continuous integration

appveyor.yml

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+# http://www.appveyor.com/docs/appveyor-yml
+
+# Use 'unstable' build worker image as it contains Cygwin
+os: Unstable
+
+branches:
+  only:
+    - master
+  except:
+    - gh-pages
+
+environment:
+  global:
+    CYG_ROOT: C:/cygwin
+    CYG_CACHE: C:/cygwin/var/cache/setup
+    CYG_MIRROR: http://mirrors.kernel.org/sourceware/cygwin/
+    OPAM_DIR: C:/opam
+
+cache:
+  - C:\opam
+
+install:
+  - set PATH=%OPAM_DIR%\bin;%PATH%
+#  - appveyor DownloadFile "http://cygwin.com/setup-%CYG_ARCH%.exe" -FileName "%CYG_ROOT%\setup-x86.exe"
+  - '"%CYG_ROOT%\setup-x86.exe" -qnNdO -R "%CYG_ROOT%" -s "%CYG_MIRROR%" -l "%CYG_CACHE%" -P make -P gcc-core -P ocaml -P ocaml-compiler-libs -P m4 -P tar -P patch -P flexdll -P pcre >NUL'
+  - '%CYG_ROOT%\bin\bash -lc "cygcheck -dc cygwin"'
+  - '%CYG_ROOT%\bin\bash -lc "echo \"OCaml version `ocamlc -version`\""'
+  - appveyor_install.cmd
+
+build_script:
+  - 'echo Build in "%APPVEYOR_BUILD_FOLDER%"'
+  - '%CYG_ROOT%/bin/bash -l "%APPVEYOR_BUILD_FOLDER%/appveyor_build.sh"'

appveyor_build.sh

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+#!/bin/bash
+
+cd "$APPVEYOR_BUILD_FOLDER"
+
+echo "Initialize OPAM..."
+opam init -y -a
+opam install -y ocamlfind ocaml-data-notation ocamlmod ocamlify
+eval $(opam config env)
+export OCAML_TOPLEVEL_PATH=$(opam config var toplevel)
+
+echo "Compile OASIS..."
+ocaml setup.ml -configure
+ocaml setup.ml -build
+

appveyor_install.cmd

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+REM Environment variables set in appveyor.yml
+
+if not exist %OPAM_DIR%\bin\opam.exe (
+  echo Compiling opam to %OPAM_DIR% ...
+  mkdir "%OPAM_DIR%"
+  git clone https://github.com/ocaml/opam.git C:\temp\opam
+  %CYG_ROOT%\bin\bash -lc "cd \"/cygdrive/c/temp/opam\" && env DJDIR=workaround ./configure --prefix=%OPAM_DIR% && make lib-ext && make && make install"
+  goto :endopam
+)
+echo Using %OPAM_DIR%\bin\opam.exe ...
+:endopam