Merge pull request #11 from vunb/build

install global module

Author: vunb

appveyor.yml

@@ -23,8 +23,9 @@ install:
   # install submodules
   - git submodule update --init
   # fixes nodejs/node-gyp#972
-  - npm install -g npm@next
+  - npm install -g npm@latest
   # install modules
+  - npm install -g node-pre-gyp node-pre-gyp-github
   - npm install --build-from-source
   # Check if we're building the latest tag, if so
   # then we publish the binaries if tests pass.