Option for filtered list to allow empty sections
Fix minor bug in filtered collection list
Unit test for moving object with empty sections allowed
Rename flag to be more consistent with "filtering"
Specify section order in fetch order test, add test for concurrent FRC updates
Merge pull request #23 from Raizlabs/ND-EmptyFilterSections

Option not to filter out empty sections
No need to cast in base class anymore
Revert "Rename _Private header file to _Protected" - Doesn't allow header cycling in Xcode

This reverts commit 4495b37f251d41273c5ebcdc607cb96012ad2050.
fix spelling
Final pull request fixes
Merge from ND-BatchRefactor