Added bound to number of HTTP redirects, and prevented redirect loops.
auto merge of #1562 : wowus/servo/master, r=metajack

Is there a central configuration module which I can query for max_redirects?
Make Node::{remove, insert} take a descriptive enum for suppress_observers instead of a boolean.
auto merge of #1582 : saneyuki/servo/1569, r=Ms2ger

retry: #1581

this will fix #1569
Merge remote-tracking branch 'upstream/master' into option_size