Modify node traversal loop to avoid JS roots assertion. Fixes #2321.
Fix JS roots assertion when clicking on an element
auto merge of #2340 : glennw/servo/js-click-assert, r=jdm
Fix a few mutability warnings
auto merge of #2356 : glennw/servo/warnings, r=jdm
auto merge of #2339 : glennw/servo/js-event-assert, r=jdm
Make configure recognize the '-h' option in addition to '--help'.
auto merge of #2358 : zwarich/servo/configure-dash-h, r=Ms2ger
Use Vec for SimpleHashCache::entries.
Use Vec in the quicksort test.
Use Vec in GetClientRects.
Remove unused zip_copies.
Use Vec in reftest.rs.
Use Vec in contenttest.rs.
auto merge of #2360 : Ms2ger/servo/vec, r=jdm
 Convert as many of Page's RefCell fields to Cell as possible #1990

Convert as many of Page's RefCell fields to Cell as possible #1990
Convert as many of Page's RefCell fields to Cell as possible #1990
fix by critics
Convert as many of Page's RefCell fields to Cell as possible #1990
remove semicolon