allow resource expansions to be cached (fix greedy non-caching conditional)
allow resource expansions to be cached (fix greedy non-caching conditional)

this intention of this conditional was to bypass the cache for collection 
resources, but had an additional consequence of not caching resource 
expansions when you are asking for a resource
stormpath/stormpath-sdk-node,peebles/stormpath-sdk-node,peebles/stormpath-sdk-node,ck-lee/stormpath-sdk-node,stormpath/stormpath-sdk-node,wakashige/stormpath-sdk-node