[FIX] problem with messaging:searchview label,action no internet connect...

Respected Sir,
issues fixed with this branch:
- Notification: 
 - For Count of All Unread Message in notification replace "new" string to "unread" messages
- With no subject messages show "Re:false" when replying to message
- Crash when click on To-do in message list with no connection
- Like/unlike issue when no connection (it will changed when no connection but actually not updating any record)
- Remove message author id from partner_ids when sending reply
- Message list read/unread background not changing on to_read status
- Usability: 
  -User message when no result found in searchView
Add network connectivity check code in ```App``` class.
Use it by calling App.