Commits on May 20, 2016

1. Add deprecate mixins …

   This borrows heavily from how we deprecate features in Neat using Sass @warn:
   thoughtbot/neat@5c337cc
   
   One key difference from Neat is that we only want to use this mixin for
   deprecations, not all warnings. The reason is because with CSS, it's not always
   a straightforward task to upgrade libraries or frameworks; particularly major
   releases. So we offer a toggle to globally disable deprecation warnings, but for
   other meaningful warnings we need to throw, we still output those.
   
   To deprecate a feature, you include the `_bourbon-deprecate` mixin to throw a
   Sass warning, providing a detailed message that gives context.
   
   We offer a variable to allow people to disable deprecation warnings from being
   output.
   
   One problem with this system is that we cannot use these deprecation mixins to
   deprecate a function. This is because Sass doesn't allow you to include a mixin
   in a function. For now, since we only have a few functions up for deprecation,
   we can live with this and manually write warnings for those.

   Tyson Gach committed May 20, 2016
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2. Add deprecation warnings …

   Add deprecation warnings for features that will be removed or changed in 5.0.0.
   
   For more information on why most of these features are being removed, see:
   #702

   

   tysongach authored and Tyson Gach committed May 20, 2016
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