HTMLImageElement attribute getters and setters
inline pseudo element
Rename before_remove_attr and after_set_attr to allow reusing those names in the next commit.
Add support for trait-based virtual methods on Nodes, and use it for before_remove_attr and after_set_attr.
Integrate Element's after_set/remove behaviour into the virtual method hierarchy.
Add overridable tree binding/unbinding behaviour.
Remove the IElement trait.
Make register_named_element more efficient
Add a reftest for the pseudo element
Replace @s with Rc types.(fixes #2079)
auto merge of #2085 : lpy/servo/issue2079, r=jdm

see #2079
split servo build into library (non-android) for use in embedding
Update fontconfig submodule version to fix linker order bug
auto merge of #2096 : larsbergstrom/servo/fix_fontconfig, r=jdm

Please don't r+ until https://github.com/mozilla-servo/rust-fontconfig/pull/12 is merged.

r? @SimonSapin @mbrubeck

or whomever.
auto merge of #2071 : hyunjunekim/servo/try, r=larsbergstrom

If <span> element has pseudo style, draw pseudo element.
auto merge of #2087 : Ms2ger/servo/vtable2, r=jdm

Fixes #1527. Does *not* include the code for #1528.

(Originally by @jdm in #1688 and #1866.)
auto merge of #2094 : Manishearth/servo/id-efficiency, r=Ms2ger

This improves the code written for #1822 to use a single linear traversal.

The current code uses a binary search with `CompareDocumentPosition()` for comparing element position, however this method internally calls `traverse_preorder()` (i.e. a linear traversal) so calling this on every pass is quite inefficient.
A couple of != reftests (#2090)
Add the second reftest (#2090)
auto merge of #2098 : Manishearth/servo/ref-noteq, r=metajack

See #2090

One reftest compares a green image to a white div. The other has green text being compared with normal text.

If necessary, I can add some absolute positioning ones.