Support data field as body for link operation

Signed-off-by: Clark Wang <clark.wangs@gmail.com>
Add tests for hasManyThrough link with data

Signed-off-by: Clark Wang <clark.wangs@gmail.com>
Restrict that only hasManyThrough can have additional properties

Signed-off-by: Clark Wang <clark.wangs@gmail.com>
Restrict: only hasManyThrough relation can have additional properties

Signed-off-by: Clark Wang <clark.wangs@gmail.com>
user#login include server crash fix

Signed-off-by: Alexander Ryzhikov <coobaha@gmail.com>
Merge pull request #545 from zxvv/master

Add an ACL to User, to allow everyone to execute User.passwordReset().
Merge pull request #529 from Coobaha/fix/user_include

user#login include server crash fix
Merge pull request #522 from clarkorz/feature/link-with-data

Support data field as body for link operation