Update gleam, clear initial framebuffer under glutin.
Include gleam for android
auto merge of #4398 : glennw/servo/glutin-clear, r=pcwalton
Update rustc to revision 3dcd2157403163789aaf21a9ab3c4d30a7c6494d.
Various compile fixes for android rustup (link still fails).
auto merge of #4405 : servo/servo/rustup_20141124, r=jdm
Compile fix for glutin feature after rust upgrade.
auto merge of #4414 : glennw/servo/fix-glutin, r=larsbergstrom
layout: Implement `empty-cells` per CSS 2.1 § 17.6.1.1.