1. return is_my_vote(true/false),is_my_flag(true/false) in anno.get api;
2. return followup_list in anno.get api.
Merge pull request #43 from topcircler/master

1. return is_my_vote(true/false),is_my_flag(true/false) in anno.get api;
1. support screenshot download.
Merge pull request #44 from topcircler/master

support screenshot download
support vote/flag delete operation by anno_id.
Merge pull request #45 from topcircler/master

support vote/flag delete operation by anno_id.