ihrasko: add testing with Python 3.4 at AppVeyor

appveyor.yml

@@ -5,9 +5,9 @@
 # OS: 64-bit Windows Server 2012 R2
 # Compilers: 64-bit MinGw-w64 5.1.0 (downloaded during script execution)
 # Python: 2.7, both 32-bit and 64-bit versions
+# Python: 3.4, both 32-bit and 64-bit versions
 #
 # Notes:
-# Can be extended for use with Python 3
 # Where "ps:" is used commands are executed in PowerShell
 ##
 
@@ -21,12 +21,17 @@ environment:
 # set MinGw-w64 (64-bit) version 5.1.0 download URL
   url: http://kent.dl.sourceforge.net/project/mingw-w64/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-builds/5.1.0/threads-posix/seh/x86_64-5.1.0-release-posix-seh-rt_v4-rev0.7z
 # user can possibly use different Python versions, we try to test multiple cases
-# 64-bit version is recommended
+# 64-bit version on 64-bit system allows easier installation of Python packages using .exe installers
+# and better CMake automatic detection of some Python tools
   matrix:
 # Python 2.7; 32-bit version
     - python: C:\Python27;C:\Python27\Scripts
 # Python 2.7; 64-bit version
     - python: C:\Python27-x64;C:\Python27-x64\Scripts
+# Python 3.4; 32-bit version
+    - python: C:\Python34;C:\Python34\Scripts
+# Python 3.4; 64-bit version
+    - python: C:\Python34-x64;C:\Python34-x64\Scripts
 
 build_script:
 # add location of used Python to path