cleaned: appveyor: Easier to detect bugs

* appveyor.yml conf file to simple from offcial reference
* Make the cache easier to use by commenting out
* fixed clone directory, from stack to yesod
* curl check https
* stack URL
* split build and test, So we can easy detect build or test error
* test job to single thread, So we can easy find bug of test

appveyor.yml

@@ -1,19 +1,15 @@
+# cache:
+#   - '%AppData%\stack'
+
+install:
+  - curl -sS -ostack.zip -L https://get.haskellstack.org/stable/windows-i386.zip
+  - 7z x stack.zip stack.exe
+  - stack setup > nul
+
 build: off
 
-before_test:
-# http://help.appveyor.com/discussions/problems/6312-curl-command-not-found
-- set PATH=C:\Program Files\Git\mingw64\bin;%PATH%
-
-- curl -sS -ostack.zip -L --insecure http://www.stackage.org/stack/windows-i386
-- 7z x stack.zip stack.exe
-
-clone_folder: "c:\\stack"
-environment:
-  global:
-    STACK_ROOT: "c:\\sr"
+build_script:
+  - stack --no-terminal test --no-run-tests
 
 test_script:
-- stack setup > nul
-# The ugly echo "" hack is to avoid complaints about 0 being an invalid file
-# descriptor
-- echo "" | stack --no-terminal test
+  - stack --jobs 1 --no-terminal test