Add support for background-size in the shorthand property #65
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The
background
property supports background size in addition to the other long-form properties. When we have a separatebackground-size
property and when we create a shorthand version, we must include thebackground-size
in the shorthand by preceding it with a slash:/
and vice versa—when we’re parsing a shorthand property, we must look for and fetch thebackground-size
before we extractbackground-position
as otherwise it might be ambiguous.This should fix premailer/premailer#252 and premailer/premailer#216.