Update Rust
Merge remote-tracking branch 'origin/master' into HEAD

Conflicts:
	src/components/script/dom/bindings/proxyhandler.rs
	src/components/script/dom/bindings/text.rs
Rebase and update submodules
Remove incorrectly-added rust-http directory
auto merge of #821 : brson/servo/master, r=metajack

Still needs https://github.com/mozilla-servo/glfw-rs/pull/5 and https://github.com/mozilla-servo/rust-mozjs/pull/31