Add settings option to menu and use Ruby 2.1.10 in Travis

[stevenzeck]

What does this implement/fix? Explain your changes.

This adds an option to the Packages -> Atom Beautify submenu, Settings, that goes directly to the settings page for Atom Beautify. This is also available in the command palette.

During the initial Travis build, Rubocop could not be installed on the OSX build because it requires Ruby 2.1 or greater. The default is 2.0.0, thus a second change was added to use Ruby 2.1.10 so that the Travis build would pass (although it didn't fully, more on that below).
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Does this close any currently open issues?

#1869
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Any other comments?

The OSX Travis build will still fail. I'm getting the same errors with puppet-lint and sass as the master branch here. I'm still working with Travis support to try and resolve them, but the builds will continue to fail for now. Since it doesn't fail until the very end, and the Linux builds are fine, it should be safe to merge IMO.
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Checklist

Check all those that are applicable and complete.

• Merged with latest master branch
• Regenerate documentation with npm run docs
• Add change details to CHANGELOG.md under "Next" section
• Added examples for testing to examples/ directory
• Travis CI passes (Mac support)
• AppVeyor passes (Windows support)

[stevenzeck]

@Glavin001 it looks like the Ruby unit tests are skipped, does Rubocop need to be installed in the Travis build? If not, I'd rather comment it out and leave the Ruby version as is.

[Glavin001]

@szeck87 , agreed. Comment out the Ruby change and let's merge.

Thanks for contributing!

[Glavin001]

Thanks for contributing!

[Glavin001]

Published to v0.30.6