Sorting. closes robb#23
Define useful sorting blocks
WS
Improving sort test

Old test would compare already sorted arrays
Removing sortDescending
Renaming sortAscending to compare, adding tests
Adding Amiel to CONTRIBUTORS
Merge pull request #25 from robb/amiel-sorting

Add Sorting
fix compilation error for ARC projects that mix non-ARC code when importing from the prefix header
Updating project settings
Breaking retain cycle in flatten

Fixes #28
Merge pull request #27 from s12chung/development

fix compilation error for ARC projects that mix non-ARC code when import...

Fixes #26
Adding Steve Chung to CONTRIBUTORS
Uniq preserves order

Fixes #32
Merge branch 'uniq-order' into development
Adding isEmpty

Closed #35
Updating version to 0.2.1