332 - FbGraph::Application for elements in Post

TaggedObject - fetch_with_class_determination checks for namespace first and assigns it as an Application
Post - initialize checks for namespace and assigns it as an Application
332 - Specs for Application returned from Post

Post to can be assigned as an Application Type
TaggedObject can be assigned as an Application Type
Merge pull request #335 from tmlee/fix/332_post_returns_application

Fix/332 :  Post To array gives a User when it should be an Application