P6TestPerform migrated to P6TestOutage (moreover test fixed)
P6LogQuery.lastEntry and P6LogQuery.lastStack fields refactored to P6TestLogger.logs and P6TestLogger.lastStackTrace
removed unused methods
removed commented sections of P6TestBasics
Merge pull request #48 from p6spy/tests

refactored P6TestPerformance to P6TestOutage; removed log msg history from P6LogQuery; fixes #15