Fixing some tests and providing better output in system test case failure.

plugins/Goals/API.php

tests/PHPUnit/Framework/TestCase/SystemTestCase.php

...test_ArchiveCronTest_noOptions__VisitsSummary.get_day.xml

...st_ArchiveCronTest_noOptions__VisitsSummary.get_month.xml

...t_AutoSuggestAPITest_actions__VisitsSummary.get_range.xml

...toSuggestAPITest_browserCode__VisitsSummary.get_range.xml

...SuggestAPITest_browserEngine__VisitsSummary.get_range.xml

...uggestAPITest_browserVersion__VisitsSummary.get_range.xml

...test_AutoSuggestAPITest_city__VisitsSummary.get_range.xml

...SuggestAPITest_continentCode__VisitsSummary.get_range.xml

...toSuggestAPITest_countryCode__VisitsSummary.get_range.xml

...tAPITest_customVariableName1__VisitsSummary.get_range.xml

...tAPITest_customVariableName5__VisitsSummary.get_range.xml

...Test_customVariablePageName2__VisitsSummary.get_range.xml

...Test_customVariablePageName4__VisitsSummary.get_range.xml

...Test_customVariablePageName5__VisitsSummary.get_range.xml

...est_customVariablePageValue2__VisitsSummary.get_range.xml

...est_customVariablePageValue4__VisitsSummary.get_range.xml

...est_customVariablePageValue5__VisitsSummary.get_range.xml

...APITest_customVariableValue1__VisitsSummary.get_range.xml