Add Entity Audit diff to support revision comparison
Fix formatting issues
Fix wrong history table heading label
Merge remote-tracking branch 'upstream/master' into add_entity_audit_compare
Added diff method to AuditReaderInterface
Undo add AuditReader diff method
Change the compare action to re-use the existing show action for comparison
Change css .diff class scope
Fix unit tests
Added code improvements (eko comments)
Merge master - resolve Resources/doc/reference/templates.rst by using theirs
Reset templates.rst templates alignment (was merge conflict)
Merge pull request #2266 from nlzet/add_entity_audit_compare

Add Entity Audit diff to support revision comparison
Merge pull request #2268 from nlzet/add_entity_audit_diff

Added diff method to AuditReaderInterface
fix template syntax