Remove the help text for render backend option. follow up #3711.
Merge pull request #3767 from pcwalton/readme-header

readme: Embiggen the name of the project
auto merge of #3748 : mrobinson/servo/trimmer-flow-tree-output, r=mbrubeck

Logical geometry is complicated, so the string formatted output is
verbose. This means that flow tree dumps often go well beyond the
edge of the terminal screen. With a simple notation, we can shorten the
output and make it slightly easier to read. This notation also makes it
more similar to the formatted output of Rect, Point2D, and Size2D.
Use DOMRefCell for Document.
Use DOMRefCell for Event.
Use DOMRefCell for EventTarget.
Use DOMRefCell for FormData.
Use DOMRefCell for HTMLImageElement.
Use DOMRefCell for HTMLInputElement.
Use DOMRefCell for Node.

Altough LayoutDataRef is touched, we don't use DOMRefCell in it becasuse
it's expected to manipulate in other task.
Use DOMRefCell for Window.
Use DOMRefCell for ServoHTMLParser.
Use DOMRefCell for URLSearchParams.
Use DOMRefCell for XMLHttpRequest.
Use DOMRefCell for TimerManager.
Use DOMRefCell for ScriptTask.
Use DOMRefCell for Page.
auto merge of #3749 : pcwalton/servo/update-rust-azure, r=metajack

r? @metajack
auto merge of #3751 : fabricedesre/servo/update-toml, r=metajack
auto merge of #3752 : pcwalton/servo/default-cpu, r=larsbergstrom

We've discussed this some and I think there's consensus to do it as a
pragmatic decision for now. CPU painting is more stable, especially with
buggy drivers, and faster (because we aren't caching the necessary
OpenGL objects yet and possibly for other reasons), so it provides a
better "out of the box" experience for newcomers to Servo who don't know
to pass the `-c` option. This patch continues to reftest both Skia and
Skia-GL out of a desire to keep options open. Skia-GL remains a
first-class citizen.

r? @metajack