Added pagination support to Relationships

Added cursor property to Pagination model and cursor parameter to the
FollowedBy method of Relationships
Added GetSelf method to Users

Added GetSelf method to Users to get the currently logged in user record
Added pagination to Follows
Added pagination tests, fixed UsersResponse

Added pagination tests and added a missing property to the UsersResponse
class
Update README.md
Added test for GetSelf
Merge pull request #52 from geo242/master

Added pagination to Relationships and added GetSelf method