Revert "Fixed Nimubs 1.0 podspec: Needs arc disabled to compile successfully."
See discussion here: https://github.com/CocoaPods/Specs/commit/c19aca9ec7498eaa1d29901b3bebadb44bf0ff5f

This reverts commit c19aca9ec7498eaa1d29901b3bebadb44bf0ff5f.