Merging changes from AeroXuk/libpostal_windows.

.appveyor.yml

@@ -0,0 +1,26 @@
+version: 1.0.{build}
+
+branches:
+  only:
+    - master
+
+image: Visual Studio 2015
+platform: x64
+
+environment:
+  matrix:
+  - COMPILER: msys2
+    PLATFORM: x64
+    MSYS2_ARCH: x86_64
+    MSYS2_DIR: msys64
+    MSYSTEM: MINGW64
+    BIT: 64
+
+install:
+  -'%APPVEYOR_BUILD_FOLDER%\win_install.bat'
+
+build_script:
+  - '%APPVEYOR_BUILD_FOLDER%\win_build.bat'
+
+test_script:
+  - 'echo No tests yet'