Merge pull request #40 from topcircler/master

Support 'projection' for anno entity; change 'comment property name to 'anno_text'.
Added api for copy db tool
Added copy db tool
Merge pull request #41 from SergeyGadzhilov/master

Added api for copy db tool
1. return user information during anno get;
2. CRUD of vote/flag/follow_up.