Fix youtube specs and attributes

[joaocv3]

• Changed all necessary attributes for youtube scrapper. All attributes accessed via CSS are no longer available
• All HTTP interactions for youtube_spec and youtube_scrapper_spec use VCR now, the API_KEY does not need to be committed anymore.
• Updated the Guard Rspec cmd option
• Very little channel information is provided for the Youtube scraper video request. So these changes add one request for the youtube channel endpoint when necessary.

[houndci-bot]

Some files could not be reviewed due to errors:

.rubocop.yml: Style/DotPosition has the wrong namespace - should be Layout

.rubocop.yml: Style/DotPosition has the wrong namespace - should be Layout
.rubocop.yml: Style/FileName has the wrong namespace - should be Naming
.rubocop.yml: Style/PredicateName has the wrong namespace - should be Naming
.rubocop.yml: Style/AccessorMethodName has the wrong namespace - should be Naming
Error: The `Style/TrailingCommaInLiteral` cop no longer exists. Please use `Style/TrailingCommaInArrayLiteral` and/or `Style/TrailingCommaInHashLiteral` instead.
(obsolete configuration found in .rubocop.yml, please update it)
obsolete parameter MaxLineLength (for Style/IfUnlessModifier) found in .rubocop.yml
`Style/IfUnlessModifier: MaxLineLength` has been removed. Use `Metrics/LineLength: Max` instead

[coveralls]

Coverage remained the same at 99.912% when pulling 4edc14d on joaocv3:fix-youtube-specs into 9cd9700 on thibaudgg:master.

[coveralls]

Coverage remained the same at 99.912% when pulling 4edc14d on joaocv3:fix-youtube-specs into 9cd9700 on thibaudgg:master.

[thibaudgg]

Hi @joaocv3, this PR looks great! Thanks a lot, that's really promising! 👍