Merge pull request #284 from jekyll/appveyor2

Appveyor fix

Author: mertkahyaoglu

appveyor.yml

@@ -2,14 +2,15 @@ environment:
   nodejs_version: "6"
   RACK_ENV: test
   JEKYLL_LOG_LEVEL: warn
+  RUBY_VERSION: 22
   matrix:
     - TEST_SUITE: node
     - TEST_SUITE: ruby
 
 install:
-  - set PATH=C:\Ruby22\bin;%PATH%
+  - set PATH=C:\Ruby%RUBY_VERSION%\bin;%PATH%
   - ps: Install-Product node $env:nodejs_version
-  - gem install bundler --no-ri --no-rdoc
+  - gem install bundler --no-ri --no-rdoc --version '1.13.7'
   - bundle config --local path vendor/bundle
   - sh script/bootstrap