Certgenerator

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- Update certificate.py
* Add parameter 'password' to function generate_multiple_p12()
- Update cli.py
* Add option '--paswword' to command 'create-multiple-p12'

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- Version Control

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- Update cli.py
* Delete options 'debug' and 'verbose' for main command
* Add options 'debug' and 'verbose' for commands: 'create', 'create-multiple', 'create-p12', 'create_multiple_p12'
* Improve command 'delete' using context manager
- Update decorators.py
* Add decorator 'debug_options'
* Add context manager RemoveOption()

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- Update cli.py
* Display app folder with command config read
- Update tools.py
* Change 'cert_directory' to 'app_folder' in custom section of config.ini

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- Update certificate.py
* function self.exists() => pass default value of trigger_warning to False
* function self.output() => display message if level == logging.WARNING
- Update decorators.py
* decorator global_options() => add help fo --san option
- Improve README

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- Improve README