[comments-view] - Fix 'No citizen has argumented on this law yet' message
[models:comment] - Update reference data type to Schema.Types.Mixed
[db-api:law] - Update query to get comments on a law either by an ObjectId or a String
Merge branch 'master' of github.com:DemocracyOS/app
Merge branch 'fix/comments'
Release 0.8.18