3.4.25 (7 July 2017)
* Fix a bug where * wouldn't always be eliminated during selector unification.
Deprecations -- Must Read!
* Extending compound selectors such as .a.b is deprecated. This never followed
the stated semantics of extend: elements that match the extending selector
are styled as though they matches the extended selector.
* When you write h1 {@extend .a.b}, this should mean that all h1 elements are
styled as though they match .a.b¡½that is, as though they have class="a b",
which means they'd match both .a and .b separately. But instead we extend
only selectors that contain both .a and .b, which is incorrect.
* Color arithmetic is deprecated. Channel-by-channel arithmetic doesn't
correspond closely to intuitive understandings of color. Sass's suite of
color functions are a much cleaner and more comprehensible way of
manipulating colors dynamically.
* The reference combinator, /foo/, is deprecated since it hasn't been in the
CSS specification for some time.
* The old-style :name value property syntax is deprecated. This syntax is not
widely used, and is unnecessarily different from CSS.
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