Update release notes
Merge pull request #197 from wmde/propertyidprovider

Update release notes for PropertyIdProvider
Create initial version of ByPropertyIdGrouper
Finish tests and add release notes
Merge pull request #199 from wmde/bypropertyidgrouper

[WIP] Create initial version of ByPropertyIdGrouper
Create initial version of BestStatementFinder
Use ByPropertyIdGrouper
Created tests
Update release notes
Merge branch 'beststatementfinder' of https://github.com/wmde/WikibaseDataModel into beststatementfinder

Conflicts:
	src/BestStatementFinder.php
	tests/unit/BestStatementFinderTest.php