Add Test Suite finish compatibility for Xcode 6 beta 4

Compatible for Xcode 5 and Xcode 6.

Xcode 5 Log:
Test Suite 'SCTests_ResultInterpreter' started at 2014-08-01 04:09:27 +0000
...
Test Suite 'SCTests_ResultInterpreter' finished at 2014-08-01 04:09:27 +0000.
Executed 24 tests, with 0 failures (0 unexpected) in 0.024 (0.025) seconds

Xcode 6 beta 4 log:
Test Suite 'SCTests_ResultInterpreter' started at 2014-07-31 23:23:19 +0000
...
Test Suite 'SCTests_ResultInterpreter' passed at 2014-07-31 23:23:19 +0000.
	 Executed 24 tests, with 0 failures (0 unexpected) in 0.031 (0.037) seconds