Publish to npm when releasing.

Update the release script to execute `npm publish`.  The command will be
skipped if `npm whoami` fails or if the user is not listed by `npm owner ls`.

Closes #74.
Merge pull request #151 from nicksay/npm-publish

Publish to npm when releasing.
Cleanup spf.net.script and spf.net.style tests.

Minor adjustments to make the tests more consistent.

Progress on #60.
Merge pull request #150 from nicksay/resource-loading-streamline-tests

Cleanup spf.net.script and spf.net.style tests.
Update resource loading implementation to handle only one URL per name

This follows up on the previous API change that allowed only one URL per name
during script/style loading and transitions the underlying implementation to
match the API.

Progress on #25.