homebrew: toggle analytics (off by default)

[hraban]

Is there an easy way to add "test groups" or somehow modularize tests? I wanted to add another test where the setting is explicitly toggled off but it would become a bit messy to have three separate homebrew tests top level

[hraban]

@Enzime could I bother you for a review?

[malob]

Thanks for adding this. A couple notes:

• To keep with the convention of this module, could you change name to be analytics as opposed to noAnalytics, and invert the behavior/default accordingly.
• Could you also update the description to be consistent with the other options, including adding an "implementation note".