add Windows testing

.Rbuildignore

@@ -6,3 +6,4 @@
 ^CHANGELOG\.md$
 ^\.lintr$
 ^inst/\.lintr$
+^appveyor\.yml$

.gitattributes

@@ -0,0 +1,4 @@
+* text=auto
+data/* binary
+src/* text=lf
+R/* text=lf

appveyor.yml

@@ -0,0 +1,60 @@
+# DO NOT CHANGE the "init" and "install" sections below
+
+# Download script file from GitHub
+init:
+  ps: |
+        $ErrorActionPreference = "Stop"
+        Invoke-WebRequest http://raw.github.com/krlmlr/r-appveyor/master/scripts/appveyor-tool.ps1 -OutFile "..\appveyor-tool.ps1"
+        Import-Module '..\appveyor-tool.ps1'
+
+install:
+  ps: Bootstrap
+
+# Adapt as necessary starting from here
+
+environment:
+  global:
+    WARNINGS_ARE_ERRORS: 1
+
+  matrix:
+    - R_VERSION: oldrel
+      R_ARCH: i386
+    - R_VERSION: oldrel
+      R_ARCH: x64
+    - R_VERSION: release
+      R_ARCH: i386
+    - R_VERSION: release
+      R_ARCH: x64
+    - R_VERSION: devel
+      R_ARCH: i386
+    - R_VERSION: devel
+      R_ARCH: x64
+
+build_script:
+  - travis-tool.sh install_deps
+
+test_script:
+  - travis-tool.sh run_tests
+
+on_failure:
+  - 7z a failure.zip *.Rcheck\*
+  - appveyor PushArtifact failure.zip
+
+artifacts:
+  - path: '*.Rcheck\**\*.log'
+    name: Logs
+
+  - path: '*.Rcheck\**\*.out'
+    name: Logs
+
+  - path: '*.Rcheck\**\*.fail'
+    name: Logs
+
+  - path: '*.Rcheck\**\*.Rout'
+    name: Logs
+
+  - path: '\*_*.tar.gz'
+    name: Bits
+
+  - path: '\*_*.zip'
+    name: Bits