Connection requests action bar icon added

1) I created a separate layout only for that icon. The layout is called
menu_item_connection_requests.xml.
2) I added the icon in the drawable folders
3) I added more functionality in the profile activity:
- first I inflate the common menu items
- next I check if the user has any connection requests.
If so, then I inflate the menu_item_connection_requests,
otherwise I do nothing.
4) I also renamed the ConnectionRequestsModel to
ConnectionRequestSendModel and added a new model called
ConenctionRequestModel which holds the data for each connection request
of the user
Removed some icons that I don't need