add relationships to user
integrate huanxin

* rake done
token as CONSTANT for huanxin is strict it
use redis
register user for huanxin when signup
add block to relationship
follow unfollow  following list
black list
huanxin restful op
huanxin api
add blacklist and block and unblock
follow, unfollow, block, unblock test
block and unblock api
black list api
black list
add test
update api
add api get_other_user_info
api get_other_user_info
add gender field to user and update signup api