🦄 Move web handlers to separate modules

• metrics handler is optional and moved to MetricHandlerModule
• profile handler is optional and moved to ProfileHandlerModule
• reorder if-statement in newHTTPServer

🦉 Web handlers in container

• metrics handler in container with name metric_handler
• profile handler in container with name pprof_handler
• phasing out go-convey

🦅 Sampling configuration for logger

• you can set logger sampling
• provide logger.sampling.initial and logger.sampling.thereafter in your config change sampling config

🔬 Fixed bug in `CatchTrace`

Bug was in method CatchTrace, because we must check Value's for valid:

if !v.FieldByName("Reason").IsValid() || !v.FieldByName("Func").IsValid(
	break
}

🗃 Demos moved to separated repository

• Demos moved to separated repository
• Removed unused dependencies (urfave/cli and davecgh/go-spew)
• Fixes for Readme (examples part)

👻 Small improvements for logger

• you can enable CapitalColorLevelEncoder by logger.color: true
• you can enable FullCallerEncoder by logger.full_caller: true

🥳 Small fixes around logger module

• you can enable zap.NewDevelopmentConfig()
• you can disable app_name and app_version
• add Readme description

🍀 Environment configuration fix

Thanks to @jenchik

🎉 Golang 1.12 release

• prepare to Golang 1.12
• move to TravisCI
• update goconvey / goconvey tests
• add CatchTrace to debug application

🐰 Dependencies hotfix

// Blocked in Russia
replace bou.ke/monkey v1.0.1 => github.com/bouk/monkey v1.0.1