Enhancements:

• uber-go#1378: Add WithLazy method for SugaredLogger.
• uber-go#1399: zaptest: Add NewTestingWriter for customizing TestingWriter with more flexibility than NewLogger.
• uber-go#1406: Add Log, Logw, Logln methods for SugaredLogger.
• uber-go#1416: Add WithPanicHook option for testing panic logs.
• #7ff4121, #33396ec, #7df6326, #c0e7252, #770a192: Babico's shit