Bothub-cli

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* hotfix: error with os.path.dirname

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* fix: create .bothub directory, handle that caches.yml file is empty. Thanks to Bokyeong Kwon

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* add: -l option for ``bothub ls``
* add: --version option
* add: check latest version
* add: check auth token expiration
* tune messages

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* fix: handle EOF case in ``bothub test``
* fix: consider plain log message case
* fix: inject an event and context object for local NLU test
* update README

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* keep command history for ``bothub test``
* add a ``logs`` command
* watch deployment progress

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* handle a case no proper project found