Merge pull request #1 from frankchn/master

debugging infrastructure for proco2012
Intermediate frontend changes
Merge branch 'master' of github.com:strategist333/contest
Refactored interactive and speed graders
Updated debug grader, works with tempfile
Frontend touchups. Now looks much prettier
Update judgment max delay to accommodate many test cases
Added basic auth support
Default metadata fields now set by problems on config
Added grader caching support
Changed payload type from mediumblob to longblob
Minor bug fixes; reupload file and persist login fields
Added manual grader
Added judge scoreboard
Added hand judgments page
Minor cosmetic changes
Added manual regrade functionality
Added time column to judge scoreboard
Clean up team frontend, add frozen indication to scoreboard
Added time multiplier feature