v0.4.0

API breaking:

• outContext.IsEnabled() replaced with logger.IsOutputEnabled()
• logger.NewClient(s,l) renamed to logger.NewClientWithLevel(s,l)
• new logger.NewClient(s) - gets only name (minimal min level set)

API backward compatible:

• added logger.IsOutputExists(), logger.IsOwnClient()
• returned to public: types OutType, LogClient, OutContext; const DEFAULT_*

Altering behavior:

• delimiter added in log string after level code

Misc:

• docs improvements
• dozen of bugfixes (and test fixes of course)