Added session and users path helpers to persistence manager.
Added session and users path helpers to persistence manager.

layerhq/Atlas-Messenger-iOS,Eynaliyev/Atlas-Messenger-iOS,layerhq/Atlas-Messenger-iOS,InterfaceInc/Atlas-Messenger-iOS,InterfaceInc/Atlas-Messenger-iOS,ropik/Atlas-Messenger-iOS,ropik/Atlas-Messenger-iOS,Eynaliyev/Atlas-Messenger-iOS,InterfaceInc/Atlas-Messenger-iOS