Auto merge of #256 - canaltinova:atoms, r=SimonSapin

Add "contents" and "scroll-position" keywords to local names

They are needed for servo/servo#15813

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/html5ever/256)
<!-- Reviewable:end -->

Author: bors-servo

atoms/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "html5ever-atoms"
-version = "0.2.0"
+version = "0.2.1"
 authors = [ "The html5ever Project Developers" ]
 license = "MIT / Apache-2.0"
 repository = "https://github.com/servo/html5ever"

atoms/local_names.txt

@@ -183,6 +183,7 @@ compose
 condition
 conjugate
 content
+contents
 contentScriptType
 contentStyleType
 contenteditable
@@ -791,6 +792,7 @@ scriptminsize
 scriptsizemultiplier
 scrolldelay
 scrolling
+scroll-position
 sdev
 seamless
 sec