Rust upgrades
Remove all traces of Box representation from bindings. Work around file read runtime problem.
Warning police.
Update submodules for warning police.
Rust upgrade for android
Rust upgrades
Make tests pass once more.
Check properly for None in the headless compositor case
Rust upgrade for new master rebase
auto merge of #1934 : larsbergstrom/servo/rust_20140224_squashed, r=jdm

For review only - don't approve yet (need to squash and land submodule updates first). 

critic? @metajack