wrapped in div:feedlyconsole to parallel extension
Root node and children work
factored out _resolvePath
Reached equivalent functionally to pre-class code.

Removed caching from ApiRequest, its now implicit in node structure.
Changed ajax callback from done to always, so that an error in ajax
request will appear as an invalid directory
FeedlyApiRequest validates against array of valid feedly calls.
FeedlyNode now tracks type - leaf type has no children.
Cleaned up debug messages.