Disable travis
Merge pull request #3473 from servo/disable_travis

Disable travis

Reviewed-by: SimonSapin
layout: Consider relatively positioned blocks as possible block
formatting contexts, and translate floats out of block formatting
contexts.

These improve Reddit.
Merge pull request #3475 from pcwalton/block-formatting-context-fixes

layout: Consider relatively positioned blocks as possible block

Reviewed-by: glennw
layout: Float table wrappers directly instead of generating a block
wrapper around them.

Fixes Wikipedia tables leaking out.

Along the way, I refactored tables' width calculation significantly.
This was necessary in order to properly handle floated tables, as some
of the logic had to be ported over from block flows.