Merge pull request #2 from stas-tanko/dev

Dev
Merge pull request #9 from stas-tanko/stas

Stas
add comments, checklists and attachments
Merge branch 'alex' of https://github.com/kholdrex/iota-project into alex
refactor_rename_database.yml
Merge pull request #10 from kholdrex/alex

Add models for comments, checklists and attachments
fixed database sample
fixed db sample #2
added state_machine