Move find_fragment_node to Document.
Remove the fragment_node field from Page (fixes #3543).

Since Page isn't reflected, it cannot be rooted, and pointers to JS-managed
objects inside it are not guaranteed to be traced. This may cause the pointer
to become dangling.
gfx: Use subpixel positioning for glyphs.

Improves text rendering significantly.
auto merge of #3560 : pcwalton/servo/subpixel-glyph-positioning, r=mbrubeck

Improves text rendering significantly.

r? @mbrubeck
Clear the fragment_name field when resizing.

This reinstates the behaviour from before the change in
a1bf49c1ce61e4df1b788960826b45c6469ad976.
auto merge of #3558 : Ms2ger/servo/fragment-node, r=jdm
Add --verbose to build-cef command
auto merge of #3561 : metajack/servo/build-cef-verbose, r=zwarich
Cleanup Document.find_fragment_node.
Use or_else in Document.find_fragment_node.
auto merge of #3562 : Ms2ger/servo/cleanup-fragment-node, r=jdm