README edits and continued test tweaking

Author: travco

README.md

@@ -362,7 +362,8 @@ As with any piece of code, it's got a few quirks. Behaviors that are not intende
 #### 'TLDR' Contention with the `@extend` [spec](https://tabatkins.github.io/specs/css-extend-rule):
 
 - **Order of Processing/Specificity** In normal cases, the document is processed top-to-bottom; however, as a feature-fallout of the implementation, it is capable of extending in an anti-pattern (extending things yet to be declared). If what you're writing is an anti-pattern, it will throw a warning.
-- **Media-cross-media Inheritance** Attempting to extend a rule inside a media block from within another media block [is directly disallowed in the code](https://github.com/travco/postcss-extend#quirks) and will throw a warning.
+- **Specificity Inheritance** [Unlike examlple 5 in the spec](http://tabatkins.github.io/specs/css-extend-rule/#issue-bd856557), `@extend` in this plugin *will not* maintain the specificity of the rules extended to. Avoiding anti-patterns in your CSS will allow you to avoid this becoming an issue (pending browser implemenation). Does not log a warning.
+- **Media-cross-media Inheritance** Attempting to extend a rule inside a media block from within another media block [is directly disallowed in the code](https://github.com/travco/postcss-extend#extending-something-in-an-media-while-inside-an-media) and will throw a warning.
 - **Silent placeholders** Includes both the stricter `@define-placeholder` and its aliases for compatibility with [simple-extend](https://github.com/davidtheclark/postcss-simple-extend), and the `%` placeholder [from the spec](https://tabatkins.github.io/specs/css-extend-rule/#placeholder). As this isn't the native parser, the placeholder will be wiped from the CSS if it goes unused (as well as throw a warning).
 - **Subclass inheritance** Currently doesn't log a warning for its use, as it is not stated in the spec for or against its behavior (despite it logically following). All [sub classes of an extended "base" class are extended](https://github.com/travco/postcss-extend#extending-sub-classes-and-sub-elements), creating subclasses for the extending class as a means of mimicking the inheritance of specific sub-class contingencies (like `:active`)
 - **"Whiff" extension** trying to extend something that doesn't exist will log an error, and like everything else, remove the `@extend` rule.