Merge pull request #37 from Abizern/correct-targets

Correct target membership for SpectaUtilityTests
Add support for custom reporters via the SPECTA_REPORTER_CLASS environment variable.

Addresses issue #35
Merge branch 'master' of github.com:petejkim/specta
Avoid object subscripting and [Class name] for backwards and platform compatibility.
Report failures immediately so XCode's testing UI is updated in real time.

For more spartan test output, SPECTA_REPORT_FAILURES_IMMEDIATELY can be set to NO.

Fixes issue #36
https://github.com/specta/specta/issues/36