Profiling in lieu of time::time, rm util alias
ProfilerMsg ==> ProfilerCategory; all enums end in Category; added const NUM_BUCKETS; other minor changes
comment on updating NUM_BUCKETS in time.rs
auto merge of #478 : tkuehn/servo/profiling, r=pcwalton
Add underline to layout and gfx.
Added underline test
Fix rebase issues
Clean up code a little