User ChangeModel added
Merge branch 'core' of https://github.com/VladislavZhukouski/changes-tracker into core

Conflicts:
	src/ChangeTracker/ChangeTracker.Core/ChangeDataManagement/ClassificationDataReader.cs
	src/ChangeTracker/ChangeTracker.Core/ChangeDataManagement/RecordDataReader.cs
	src/ChangeTracker/ChangeTracker.Core/ChangeDataManagement/UserDataReader.cs
	src/ChangeTracker/ChangeTracker.Core/ChangeTracker.Core.csproj