debug whether dist-url is working

appveyor.yml

@@ -16,7 +16,7 @@ environment:
       nw_version: 0.8.6
       PLATFORM: x64
       msvs_toolset: 14
-      TOOLSET_ARGS: --toolset=v140 --dist-url=https://s3.amazonaws.com/mapbox/node-cpp11/
+      TOOLSET_ARGS: --dist-url=https://s3.amazonaws.com/mapbox/node-cpp11/ --toolset=v140
     - nodejs_version: 0.11.13
       nw_version: 0.10.5
       PLATFORM: x86
@@ -50,10 +50,12 @@ install:
   - npm -v
   # upgrade node-gyp to support --msvs_version=2013
   - npm install node-gyp
+  # clear out node-gyp header cache
+  - if "%msvs_toolset%" == "14" rd /s /q %USERPROFILE%\.node-gyp
   - SET PATH=C:\Program Files (x86)\MSBuild\%msvs_toolset%.0\bin;%PATH%
   - if %platform% == x64 CALL "C:\Program Files (x86)\Microsoft Visual Studio %msvs_toolset%.0\VC\vcvarsall.bat" amd64
   - if %platform% == x86 CALL "C:\Program Files (x86)\Microsoft Visual Studio %msvs_toolset%.0\VC\vcvarsall.bat" amd64_x86
-  - npm install --build-from-source --msvs_version=2013 %TOOLSET_ARGS%
+  - npm install --build-from-source --msvs_version=2013 --loglevel=verbose %TOOLSET_ARGS%
   - npm test
   - node-pre-gyp package %TOOLSET_ARGS%
   # make commit message env var shorter