Document.getElementById() should return null if the passed argument is empty.
Merge pull request #3032 from saneyuki/id

Document.getElementById() should return null if the passed argument is empty
Implement CanvasRenderingContext2D.canvas.
Merge pull request #3034 from saneyuki/canvas

Implement CanvasRenderingContext2D.canvas.
Using NodeFlags ctor to set InEnabledState when needed
Only run configure in the Rust submodule when we actually use it.
Merge pull request #3036 from servo/no-configure-rust-submodule

Only run configure in the Rust submodule when we actually use it.
Merge pull request #3035 from brunoabinader/fix-node-ctor

Using NodeFlags ctor to set InEnabledState when needed; r=Ms2ger
Run Travis-CI build on pushes to all branches, not just master.

We can add a blacklist (rather than the previous whitelist) as needed
when we get newbors running.
Merge pull request #3043 from servo/travis-all-the-branches!

Run Travis-CI build on pushes to all branches, not just master.
Have http://servo.github.io/servo/ include docs for the Rust version we use.

Closes #3038.
Merge pull request #3045 from servo/rust-doc-the-vengance-of-the-return

Have http://servo.github.io/servo/ include docs for the Rust version we use.
activate wpt-tests on linux travis file