WIP: PostPrivateStatus and NewSimpleStatus
Removed ProfileInfo type and turned those variables into type URL;
Made Post Type URLs versioned (v0.1.0 and v0.2.0); Added license more
URLs
Added working (*Client).PostPrivateStatus method, which uses the new
NewStatus function. Added 2 new fields to StatusPost struct that
appear to be in Tent v0.2.0
Fixed types of Entity and Id fields of Follower r struct
Permissions fields no longer JSON-omitted when empty
Moved tent/post.go's NewSimpleStatus func to tent/status_post.go's
NewStatus
Eliminated 'Entity' type; using 'string' instead
Fixed bug in PostPrivateStatus (reported error when none occurred)
sample-client.go now uses the new (*Client).PostPrivateStatus