Specs: add warning to style.md since we're going to rework all that

sky/specs/style.md

 Sky Style Language
 ==================
 
+THIS IS NOT UP TO DATE
+
+DO NOT IMPLEMENT THIS YET
+
+It has not been Dartified.
+
+It has not been converted to have a sane element.style API.
+
+It has not been converted to have layout be interruptible using Futures.
+
+
 Planed changes
 --------------
 
 Add //-to-end-of-line comments to be consistent with the script
 language.
 
 
 Style Parser
 ------------
 
@@ skipping 1048 matching lines @@
 ```
 
 The other elements don't have any default styles.
 
 These declarations are all shared between all the elements (so e.g. if
 you reach in and change the declaration that was added to a ``span``
 element, you're going to change the styles of all the other
 default-hidden elements). (In other words, in the code snippets above,
 the ``d`` variable is initialised in shared code, and only the
 addStyles() call is per-element.)