servo/servo — pull request #4512 by gutworth (2014-12-30 00:32:33+00:00)
Title: use geom::num::Zero rather than the deprecated num::Zero trait in std

This fixes the following warning:
```
display_list/mod.rs:735:20: 735:30 warning: use of deprecated item: Use `Int::zero()` or `Float::zero()`., #[warn(deprecated)] on by default
display_list/mod.rs:735 let zero = Zero::zero();
^~~~~~~~~~
```