Cache discovery based on the requested URL as this can change.
Merge branch 'discovery_cache' into new_21190
Add unique function to Array proto do concat can be used.
Add support to plv8 Discover to pass multiple orms as an array and get subset of resources.
Add support to Discover route for passing in which ORMs you want in your document.
Merge branch 'discovery_cache' into new_21190