tsd link doesn't support npm scoped packages

[jjrv]

When looking for Node.js packages, tsd link scans node_modules/*/packages.json (see code) but the glob should also include node_modules/@*/*/packages.json because scoped packages are installed in subfolders named after the scope (always prefixed with @).

If I change the glob pattern in the linked code to var pattern = '{*,@*/*}/' + type.infoJson; then linking works but repeated linking keeps re-discovering the same packages and appending duplicates to tsd.d.ts so other changes are still needed somewhere. Pull request #195 seems to fix the problem.

[blakeembrey]

Thanks for the PR. I just merged it and will do a release for you. Since I don't use this feature much yet, you'll have to let me know if you have more issues. Thanks!