Options parsing: fix and optimize

[juergba]

Description

We take advantage of two new yargs-parser configuration settings in order to:

• fix a bug while parsing camel-cased options
• optimize the parsing result: we just keep the canonical or its camel-cased versions of the option names.

Description of the Change

Additional settings of yargs-parser configuration:

• 'camel-case-expansion': true:
  for correct parsing of camel-cased options, eg. watchFiles ==> watch-files
• 'strip-aliased': true:
  aliases are removed from result.
• 'strip-dashed': true:
  dashed options (watch-files) are removed from result, we keep only the camel-cased versions (watchFiles)

[coveralls]

Coverage decreased (-0.003%) to 92.662% when pulling a116357 on juergba/clean-options into eed38d7 on master.

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[stale]

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This issue hasn't had any recent activity, and I'm labeling it stale. In 14 days, if there are no further comments or activity, I will close this issue.
Thanks for contributing to Mocha!