Enable testing on Windows with AppVeyor

appveyor.yml

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+platform: x64
+environment:
+ matrix:
+  - DC: dmd
+    DVersion: nightly
+    arch: x64
+  - DC: dmd
+    DVersion: nightly
+    arch: x86
+  - DC: dmd
+    DVersion: beta
+    arch: x64
+  - DC: dmd
+    DVersion: beta
+    arch: x86
+  - DC: dmd
+    DVersion: stable
+    arch: x64
+  - DC: dmd
+    DVersion: stable
+    arch: x86
+  - DC: ldc
+    DVersion: beta
+    arch: x86
+  - DC: ldc
+    DVersion: beta
+    arch: x64
+  - DC: ldc
+    DVersion: stable
+    arch: x86
+  - DC: ldc
+    DVersion: stable
+    arch: x64
+
+skip_tags: false
+branches:
+  only:
+    - master
+
+install:
+  - ps: function ResolveLatestDMD
+        {
+            $version = $env:DVersion;
+            if($version -eq "stable") {
+                $latest = (Invoke-WebRequest "http://downloads.dlang.org/releases/LATEST").toString();
+                $url = "http://downloads.dlang.org/releases/2.x/$($latest)/dmd.$($latest).windows.7z";
+            }elseif($version -eq "beta") {
+                $latest = (Invoke-WebRequest "http://downloads.dlang.org/pre-releases/LATEST").toString();
+                $latestVersion = $latest.split("-")[0].split("~")[0];
+                $url = "http://downloads.dlang.org/pre-releases/2.x/$($latestVersion)/dmd.$($latest).windows.7z";
+            }elseif($version -eq "nightly") {
+                $url = "http://nightlies.dlang.org/dmd-master-2017-05-20/dmd.master.windows.7z"
+            }else {
+                $url = "http://downloads.dlang.org/releases/2.x/$($version)/dmd.$($version).windows.7z";
+            }
+            $env:PATH += ";C:\dmd2\windows\bin;";
+            return $url;
+        }
+  - ps: function ResolveLatestLDC
+        {
+            $version = $env:DVersion;
+            if($version -eq "stable") {
+                $latest = (Invoke-WebRequest "https://ldc-developers.github.io/LATEST").toString().replace("`n","").replace("`r","");
+                $url = "https://github.com/ldc-developers/ldc/releases/download/v$($latest)/ldc2-$($latest)-win64-msvc.zip";
+            }elseif($version -eq "beta") {
+                $latest = (Invoke-WebRequest "https://ldc-developers.github.io/LATEST_BETA").toString().replace("`n","").replace("`r","");
+                $url = "https://github.com/ldc-developers/ldc/releases/download/v$($latest)/ldc2-$($latest)-win64-msvc.zip";
+            } else {
+                $latest = $version;
+                $url = "https://github.com/ldc-developers/ldc/releases/download/v$($version)/ldc2-$($version)-win64-msvc.zip";
+            }
+            $env:PATH += ";C:\ldc2-$($latest)-win64-msvc\bin";
+            $env:DC = "ldc2";
+            return $url;
+        }
+  - ps: function SetUpDCompiler
+        {
+            $env:toolchain = "msvc";
+            if($env:DC -eq "dmd"){
+              echo "downloading ...";
+              $url = ResolveLatestDMD;
+              echo $url;
+              Invoke-WebRequest $url -OutFile "c:\dmd.7z";
+              echo "finished.";
+              pushd c:\\;
+              7z x dmd.7z > $null;
+              popd;
+            }
+            elseif($env:DC -eq "ldc"){
+              echo "downloading ...";
+              $url = ResolveLatestLDC;
+              echo $url;
+              Invoke-WebRequest $url -OutFile "c:\ldc.zip";
+              echo "finished.";
+              pushd c:\\;
+              7z x ldc.zip > $null;
+              popd;
+            }
+        }
+  - ps: SetUpDCompiler
+
+build_script:
+  - ps: if($env:arch -eq "x86"){
+            $env:compilersetupargs = "x86";
+            $env:Darch = "x86";
+            $env:DConf = "m32";
+        }elseif($env:arch -eq "x64"){
+            $env:compilersetupargs = "amd64";
+            $env:Darch = "x86_64";
+            $env:DConf = "m64";
+        }
+  - ps: $env:compilersetup = "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall";
+  - '"%compilersetup%" %compilersetupargs%'
+
+test_script:
+ - echo %PLATFORM%
+ - echo %Darch%
+ - echo %DC%
+ - echo %PATH%
+ - '%DC% --version'
+ - dub test --arch=%Darch% --compiler=%DC%