Customer related remote procedures have been implemented
Small prettifies have been done
The signature of getRequiredEquipment request has been changed
* implementation of getRequiredEquipment as been changed
* EntryJsonAdapter has been added
AssignerService has been slightly refactored
Exception support has been improved

* a lot of unchecked exceptions have been replaced by checked ones
* customer related methods of admin session have been implemented
Small bugs' fixes for task management related stuff

* GsonMapper has been binded to ReadonlyCustomer instead of Customer
* PersistentTask#tryMerger() method has been fixed
Exception support has been improved
Exception support has been improved
The problem related to user logins' disclosure has been fixed

* json format has been changed
Login/logout fixed.
JS file with common literals was added.
Basic ticket model implemented