Added GraphUserPages (user-id/accounts) as an Iterator, GraphPage with basic attributes and a GraphUserPage extending GraphPage to add the AccessToken and Permissions attributes.
Added retrieval of app_data in URL
Merge pull request #113 from niraj-shah/master

Added retrieval of app_data for Page Tab Apps
Removed GraphUserPages, to get an iterable list of GraphUserPage just get via getGraphObjectList() method.
Merge pull request #102 from arturluizbr/master

Adding GraphObjects to handle /user-id/accounts