Use derived traits for Au

This code did not use derived traits previously because their methods were not
inlined, but this was fixed in mozilla/rust#10557.
auto merge of #2272 : mbrubeck/servo/geometry-cleanup, r=Ms2ger

This code did not use derived traits previously because their methods were not inlined, but this was fixed in mozilla/rust#10557. r? @pcwalton
Make TimeStamp in event.rs return the actual timestamp
Removed unnecessary return and moved crate import to script.rs
auto merge of #2275 : gsingh93/servo/master, r=Ms2ger

Timestamp should return the time the event was created, not 0. This fixes three test cases in dom/events/Event-constructors.html. This is my first pull request, let me know if there are any issues.
Use new attributes syntax in properties.rs
auto merge of #2279 : Manishearth/servo/patch-3, r=jdm