add repost web service
Merge pull request #15 from xduo/staging

Add repost web service
Merge pull request #16 from dugu108/staging

Refactor tag service
add follow/unfollow web service
Merge pull request #17 from xduo/staging

Add follow/unfollow web service
add comment service
Merge pull request #18 from xduo/staging

Add comment service
rm unused file
add notnull checker annotation
Merge pull request #19 from xduo/staging

Add null check annotation
add get sounds web service
Merge pull request #20 from xduo/staging

Add get sounds web services
bug fix
change prefix
adjusct
add group api
Merge pull request #21 from xduo/staging

Add group apis
bug fix
Merge pull request #22 from xduo/staging

Group api bug fix
add logging