Add appveyor.yml for Visual Studio 2015/2013

appveyor.yml

@@ -0,0 +1,27 @@
+version: "{build}"
+
+os: Visual Studio 2015
+
+clone_depth: 1
+
+
+environment:
+  matrix:
+    # Visual Studio 2015 64bit
+    - visualcpp: C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat
+      machine: amd64
+
+    # Visual Studio 2013 64bit
+    - visualcpp: C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat
+      machine: amd64
+
+
+init:
+  - call "%visualcpp%" %machine%
+  # For using bison.exe
+  - set PATH=%PATH%;C:\cygwin\bin;
+
+
+build_script:
+  - set MRUBY_CONFIG=appveyor_config.rb
+  - ruby .\minirake test