attempt to fix AppVeyor config file

appveyor.yaml

@@ -1,26 +1,26 @@
 # http://www.appveyor.com/docs/appveyor-yml
 
-# we're just running test scripts, not compiling anything
-build: off
-version: "{build}"
-
 environment:
   matrix:
-    - nodejs: "0.10"
-    - nodejs: "0.11"
+    - nodejs_version: "0.10"
+    - nodejs_version: "0.11"
 
 install:
   # prerequisites
-  - ps: Install-Product node $env:nodejs
-
+  - ps: Install-Product node $env:nodejs_version
   # module dependencies
   - npm install
   - npm install -g gulp
 
 test_script:
-  # useful debugging info
+  # log some useful debugging info
   - node --version
   - npm --version
   - node jsdoc.js --version
-
+  # run tests
   - cmd: npm test
+
+# we're just running test scripts, not compiling anything
+build: off
+
+version: "{build}"