Fix README of GitHub octokat
Update README with expected APIs for users
Make Hyperlink a string
Add Hyperlink#Expand
Move hyperlink into subdir hyper
Fix README for the latest Expand API
Implement Client#Get which returns Response
Update README for expected Response API
Add Response#Data
Remove client field from Root
Add Response#HasError()
Root is using the new Response API
Move Root to hyper subdir
Add test case for Link#Expand() with nil or empty M
Add Root#MarshalJSON
Add Root#AddRel
Get a single User with hypermedia-driven API
Update README for the latest API
Use Link for hyper link in Root and User
Update README to use static typing URL from root