Refactored basic flow of 'Add offer' use case
Changed access level offer connected types from public to internal with access from unit tests
Refactored logic for basic flow of adding offer and added unit tests for UserManagement class
Merge branch 'master' of https://github.com/padzikm/EasyTicket

Conflicts:
	EasyTicketLogic/EasyTicketLogic/Controllers/ApplicationController.cs
	EasyTicketWPFClient/EasyTicketWPFClient.sln
	EasyTicketWPFClient/packages/repositories.config
Added data annotations to Ticket class