Implement user service
Linked login service
Merge commit 'aeb2ded4ada41e470a30d35146baa2a984b99d13'
Merge social core
Merge commit 'f1caf3078c018cb54fc8424199449dd332fec6f9'
Expose interface SocialService
Merge commit 'f07f3c8637466c6f57c8c2c092e9ccabb53e798d'
fix bug for skill chart