Collection elementary changes added;
Merge branch 'core' of https://github.com/VladislavZhukouski/changes-tracker into core

Conflicts:
	src/ChangeTracker/ChangeTracker.AdamDataProvider/Converters/ElementaryChangeConverter.cs
	src/ChangeTracker/ChangeTracker.AdamDataProvider/Converters/ElementaryChangeConverterHelper.cs