Ensure trailing slash on $TMPDIR
Run ImageOptim in CLI mode instead of AppleScript
Fix minor formatting issues in Terminal output.
JPEGmini opening but not selecting files, fixes #60.
Merge branch 'unfold-mavericks-early-exit' into develop

* unfold-mavericks-early-exit:
  JPEGmini opening but not selecting files, fixes #60.
  Fix minor formatting issues in Terminal output.
  Run ImageOptim in CLI mode instead of AppleScript