MAINT: appveyor conda.org uploads

* turn on conda.org uploads for appveyor CI;
we never did weekly uploads for Appveyor/Windows
wheels so just turn on for merge events

* hopefully this will restrict to merges and not
successful PR branch runs by virtue of secret variable
availability only within the repo itself (so most PRs
should be opened from forks where possible)

Author: tylerjereddy

appveyor.yml

@@ -212,12 +212,11 @@ after_test:
   - C:\cygwin\bin\du -hs "%LOCALAPPDATA%\pip\Cache"
 
 on_success:
-  # Upload the generated wheel package to Rackspace
+  # Upload the generated wheel package to anaconda.org
+  # SCIPY_STAGING_UPLOAD_TOKEN is an encrypted variable
+  # used in Appveyor CI config, originally created at
+  # multibuild-wheels-staging site
   - cd ..\scipy
-  - pip install wheelhouse-uploader
-  # disable uploads because we have lost free hosting
-  # with Rackspace:
-  #- python -m wheelhouse_uploader upload
-  # --local-folder=dist
-  # %UPLOAD_ARGS%
-  # %CONTAINER%
+  - cmd: set ANACONDA_ORG="multibuild-wheels-staging"
+  - pip install git+https://github.com/Anaconda-Server/anaconda-client
+  - IF NOT "%SCIPY_STAGING_UPLOAD_TOKEN%" == "" anaconda -t %SCIPY_STAGING_UPLOAD_TOKEN% upload --force -u %ANACONDA_ORG% "%APPVEYOR_BUILD_FOLDER%/wheelhouse/*.whl"