Fixes a small bug where calling the getResources selector with an empty array as the second argument causes breakage

Adds a small number of useful selectors.

This release added support for utilizing JSON:API relationship endpoints (As described here and here). The documentation has a few examples of how to use the new API.

Updated package.json version

Upgrade keykey

Changelog #125

#23

Fix issue with payload.data not being an array while API_READ

Minor fix for stateMutation when a task had no relationships

Minor bugfix to API_READ