Added ability to upload pictures with comments and tags
Removed Task.USER_EMAIL column--just send emails in the user_id column
Implemented UserData message, send created_at for each change
Implemented synchronizing tag member metadata, minor fixes to ChangesHappened
Fixed several minor errors creating/processing tag member links
Fixed some queries to use deletion_date correctly, enqueue changes happened when tags or members added to metadata tables
Implement NowBriefed message
Never write pushed_at value in MakeChanges
Removed references to pushed_at columns in NameMaps
Renamed some arguments in NameMaps to make things a little more sensical