Remove obsolete makefile lines about Netsurf’s libcss.
Add rust-encoding as a submodule.

Upstream: https://github.com/lifthrasiir/rust-encoding
Servo’s fork: https://github.com/mozilla-servo/rust-encoding

As of this writing, upstream’s master branch targets Rust 0.8,
and its rust-0.9-pre branch targets Rust master.
Servo uses a Rust version in-between those.
I pushed a rust-servo branch to our fork
that backports from rust-0.9-pre.
Add support for non-UTF8 CSS stylesheets, with rust-encoding.
Make sure stylsheets have a base URL.
Upgrade to rust-encoding upstream.
script: Don't do anything before the window size comes in.

This fixes the `getBoundingClientRect()` content test.
Add `CompositorTask::create()` to initialize and start CompositorTask.
auto merge of #1419 : saneyuki/servo/create, r=pcwalton

This hide initializing steps of `CompositorTask` to make it easy to handle variables which related to compositor code.

Related: #1351.
Added recognition of positioned offsets

  top, bottom, right, and left
auto merge of #1407 : ibnc/servo/positioned_box_offsets, r=metajack

For #1406

Not really sure about some of my naming conventions, but offset was kinda taken in box.rs :/

Also this doesn't fully implement the offsets, but I'll do that alongside #782.
Pass parameters directly to 'run_compositor()'.
Introduce 'IOCompositor' to clean up compositor code.
auto merge of #1420 : saneyuki/servo/compositor, r=pcwalton

This change compositor code to objective, short scope, reducing closure functions. It will increase maintainability.

Related: #1351.
layout: Stop going to the DOM to guess width.
layout: Stop going to the DOM for text alignment.

Verified against the existing text alignment reftests.
layout: Stop going to the DOM for vertical align font sizing.
layout: Change a couple of `Box::new` calls that accessed the nodes into
`Box::transform`.
layout: Replace `AbstractNode`s in layout with `OpaqueNode`, preventing
DOM access during reflow.
auto merge of #1410 : pcwalton/servo/opaque-node, r=pcwalton

This shuts off all layout access to the DOM after flow tree construction, which will allow us to run script concurrently with layout during reflow and display list construction—even without the COW DOM. It also gets us closer to making `AbstractNode` noncopyable, which is important for safety because the JS GC will not trace layout.

r? @kmcallister
Remove the needless comment.