Fix model for links

The old model didn't have "title" field which prevented that value from being returned.

Bulk link request

The app can now process bulk requests for multiple links. The return will include all vendors for each link. This is limited to 10 documents.

Unfiltered vendor list

Added vendors param to the endpoint. When set to "all" (string), will not attempt to return a single recommended vendor, instead, provide a full list of vendors for the widget.

Updated docs.

New feature and stability improvements

This release includes the ability to group links by tags. This feature is in beta and isn't well documented yet.

Bugfixes

Updates default path, enables caching, fixes types.

Functional release

This is the first working version of the middleware on NPM.