Publish test to npm

This originally caused issues because sass spec was in the test
folder. As of #1698 sass spec is now an npm devDependency. Without
the test folder published the node-citgm cannot execute our
`npm test`.

package.json

@@ -41,6 +41,7 @@
     "lib",
     "scripts",
     "src",
+    "test",
     "vendor"
   ],
   "keywords": [