A few cosmetics
1. Function GetEdmSpaceType shouldn't belong to region "ApplyChanges Helpers"
2. Function GetEdmSpaceType must return null in case of multiple OSpace types found for entity type (more consistent with the old solution)
3. Move function GetEntitySetName to public. Add comment
Merge branch 'cosmetics' of https://github.com/azabluda/TrackableEntitiesContrib into azabluda-cosmetics
Corrected xml comment on GetEntitySetName.