corrected compiler flags to enable ARC build for OS X lib
Merge pull request #323 from mralexgray/arc-local

corrected compiler flags to enable ARC build for OS X lib
Fix warnings in the tests
Fix warnings in the main target
Merge 'master' into current branch
Merge pull request #330 from allending/arc-conversion

Correct OS X compiler flags
Merge pull request #326 from luisobo/fix-warnings

Fix or silent warnings.