Added "config/database.yml" to .gitignore.
Refactoring rake tasks "populate:*".
Fixed warning (I18n).
Install and configure gem 'database_cleaner'.
Do not create meeting if participants is invalid.
Added simple creating of meeting (without participants).
Enable asssets debuging.
Added selection of meeting participants on creating.
Added removing participants from meeting form.
Added searching of meetings.
Update config "database_cleaner".
Added ordering of meetings (server-side).
Added ordering of meetings (client-side).
Added unique index to table "assignments".