Implement AppVeyor CI automated build script.

appveyor.after_build.bat

@@ -0,0 +1,10 @@
+setlocal
+
+"C:\Program Files (x86)\NSIS\makensis.exe" installer\installer.nsi
+if %ERRORLEVEL% NEQ 0 goto ERROR
+
+:ERROR
+set EXITCODE=%ERRORLEVEL%
+
+:EXIT
+exit /b %EXITCODE%

appveyor.yml

@@ -0,0 +1,25 @@
+skip_tags: true
+pull_requests:
+  do_not_increment_build_number: true
+
+version: '{branch} build {build}'
+image: Visual Studio 2015
+
+init:
+  - git --version
+  - git config --global core.autocrlf true
+
+install:
+  - git submodule init
+  - git submodule update
+  - choco install nsis
+
+build_script:
+  - .\build.bat
+
+after_build:
+  - appveyor.after_build.bat
+
+artifacts:
+  - path: installer\PIME-0.15.2-setup.exe
+    name: Installer

build.bat

@@ -1,15 +1,5 @@
-mkdir build
-cd build
-cmake -G "Visual Studio 14 2015" ..
-cmake --build . --config Release
-cd ..
+cmake . -Bbuild -G"Visual Studio 14 2015"
+cmake --build build --config Release
 
-mkdir build64
-cd build64
-cmake -G "Visual Studio 14 2015 Win64" ..
-cmake --build . --config Release --target PIMETextService
-cd ..
-
-cd installer
-makensis installer.nsi
-pause
+cmake . -Bbuild64 -G"Visual Studio 14 2015 Win64"
+cmake --build build64 --config Release --target PIMETextService