Try moving wheel building into the build script

Author: Lukasa

appveyor.yml

@@ -145,8 +145,5 @@ install:
 
 build_script: appveyor/build.bat
 
-after_test:
-  - "appveyor\\build.cmd %PYTHON%\\python.exe setup.py bdist_wheel"
-
 artifacts:
   - path: dist\*

appveyor/build.bat

@@ -72,3 +72,5 @@ if %ERRORLEVEL% NEQ 0 exit 1
 
 py.test test/
 if %ERRORLEVEL% NEQ 0 exit 1
+
+appveyor\build.cmd python setup.py bdist_wheel