Merge pull request #163 from is-valid/721_live_chat_session

721 live chat session
Comments count update after adding a comment
rm puts from PusherCtrl; change .strftime('%d-%m-%Y') -> ('%T') in chat
fix '%T' in live_chats_controller.rb
show local time before message in chat
Merge pull request #164 from is-valid/fix_date_to_time_in_chat_output

Fix date to time in chat output
fix database.yml.example
fix development.yml.example and schema.rb
add mailer config for all envs
fix N+1 error
Fix merge dev into 721