Upgrade to rustc 0.13.0-dev (8b12fb326 2014-10-09 21:12:03 +0000)
Add Renato Zannon to AUTHORS
Move sinks into the tokenizer & tree builder
Add a trace hook for garbage-collected DOMs
Don't test the 'servo' branch on Travis

It won't build on nightlies.
Revert "Upgrade to rustc 0.13.0-dev (8b12fb326 2014-10-09 21:12:03 +0000)"

This reverts commit c900f67744f807c0a2fad4581b0aa5ea4ea97a5d.
Revert "Upgrade to Rust 5d653c1"

This reverts commit 353fdf4b990c51033bdf8d220a76a8eb815785e6.