Update README.md
Use a higher level ItemManager.CopyItem() instead of ItemManager.Provider.

Sitecore 8 changed the signature of ItemManager.Provider property and it
causes a runtime exception if compiled against earlier versions of
Sitecore.
Merge pull request #31 from pveller/master

Use a higher level ItemManager.CopyItem() instead of ItemManager.Provider
Added blobs sample
Updated Content Search example
Exclude readme from the nuget package
Added HowToSetUserIsAdministrator and HotToSetUserProfile samples
Started branches
Set BranchId when creating an item using db.Add()
Check can create and read branches