Add memory cache of Discovery Route query results.
Cache discovery based on the requested URL as this can change.
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.
Unique should work with objects.
Add todo
Merge pull request #1082 from bendiy/discovery_cache

Add memory cache of Discovery Route query results.