Ignore DerivedData directory for those that store it in the project.
Migrate to ARC.
Wrap runBlock: in an autoreleasepool.
Fix flaky test.
Fix crash if underlyingError parameter is nil.
Merge pull request #368 from InsertWittyName/ARC

Migrate to Arc and add autoreleasepool
Merge pull request #369 from InsertWittyName/NilErrorFix

Fix crash if underlyingError parameter is nil.
Update podspec for ARC
Bump podspec to 3.0.2
Update podspec platform