Fixes #101 - Handle suite completion text changes in Xcode 6

* Test suite completion text now says ‘passed’ or ‘failed’ instead of
only ‘finished’.

* Left existing support for ‘finished’ in place for users of old
versions of Xcode
Merge pull request #104 from supermarin/xcode6-formatting-fix

Fixes #101 - Handle suite completion text changes in Xcode 6