Update submodules for EXT_DEPS dependency tracking.
Fix unused_result warning in script_task
auto merge of #2503 : metajack/servo/ext-deps-redux, r=mbrubeck

@mbrubeck r?
Enable inline event handlers for XHR, and add most progressevent calls
auto merge of #2505 : Manishearth/servo/events-events-events, r=jdm

events events events!

Blocks #2282
auto merge of #2506 : Manishearth/servo/clickevent-warning, r=jdm
Add the 'direction' property and fix one RTL layout corner case.
Remove ConcurrentHashMap.

ConcurrentHashMap is unused and has a lot of uses of transmute_mut, so
it's best to remove it.
auto merge of #2508 : SimonSapin/servo/direction, r=pcwalton
JSRef<T> & Root<T> contains '*T' instead of RefCell.
auto merge of #2509 : zwarich/servo/remove-concurrent-map, r=pcwalton

ConcurrentHashMap is unused and has a lot of uses of transmute_mut, so
it's best to remove it.
JS<T> contains '*T' instead of RefCell.
Make 'Cell<JS<T>>' traceable.
Make 'RefCell<Vec<JS<T>>>' traceable.
Use Cell/RefCell for interior mutability of Attr, AttrList, Blob,
BrowserContext, ClientRect, and ClientRectList.
Make 'Cell<Option<JS<T>>>' traceable.
Use Cell/RefCell for interior mutability of Element.
Implement OptionalSettable for 'Cell<Option<JS<U>>>'.
Use Cell/RefCell for interior mutability of Event.
Use Cell/RefCell for interior mutability of FormData, BlobData.