Add: App: add comment form
FIx: Migration: remove parent constraint
Add: Lib: gedmo
Add: App: auto generated date_add for comment
Add: App: user and comment relations
Add: VIew: show comments
Change: Migration: parent can be null
Add: App: parent(Self-referencing) relation for comment
Add: App: comments list
Add: View: highlight own comments
Add: App: user registrator service
Add: Migration: password plain field for user table
Add: App: transparent user registration