Recurses down into the HashTree stucture using each subsequent key in the
array of keys, and returns the Set of keys of the HashTree object at the
end of the recursion.
Recurses down into the HashTree stucture using each subsequent key in
the List of keys, and returns the Set of keys of the HashTree object at
the end of the recursion.
The SpiceRack keeps a single registry-like tree for the entire JVM, though
different contexts can be accessed by creating new Spiceracks and passing in
a context name.