Virtualbox network speed test

Result: virtualbox 4.1 and 4.2 can't control network speed. The speed
is 55MB/s 76MB/s regardless of the settings.
Software bandwidth control: wondershaper doesn't work. Speed is always 0.02MB/s.
Merge branch 'master' of github.com:dbgroup-at-ucsc/imru

Conflicts:
	result/k3i1b1s3e10b100000/finished/local1500M025core16nodeskmeans.pdf
	result/k3i1b1s3e10b100000/finished/local1500M025core16nodeskmeansSpeedup.pdf
	result/k3i1b1s3e10b100000/finished/local1500M05core8nodeskmeans.pdf
	result/k3i1b1s3e10b100000/finished/local1500M05core8nodeskmeansSpeedup.pdf