changed just Makefile to test parallel code on scrimmage server. will change back after this commit
removed parallel flag
Fix a bug in tt.c
Merge branch 'master' of /afs/csail/proj/courses/6.172/student-repos/fa13/projects/project4/daewook-donggu-gxing-xinyi into submission
Merge branch 'master' of https://github.com/donggu/project4
Merge branch 'master' into submission