Enable npm and library tests on windows

appveyor.yml

@@ -3,6 +3,9 @@ environment:
   - configuration: Release
 #  - configuration: Debug
 
+install:
+  - ps: Install-Product node 6
+
 # scripts that are called at very beginning, before repo cloning
 init:
   - git config --global core.autocrlf input
@@ -17,7 +20,14 @@ platform: x64
 build_script:
   - CALL appveyor-build.bat
 
-test: off
+before_test:
+  - node --version
+  - npm --version
+  - npm install
+  - npm link
+  - SET PATH=%CD%\osrm-deps\libs\bin;%PATH%
+  - SET OSRM_BUILD_DIR=build\%Configuration%
+  - npm test
 
 artifacts:
   - path: osrm_Release.zip