new graph.
Merge branch 'master' of github.com:yangjueji/tracking

Conflicts:
	report/report.tex
	report/soccer.jpg
	report/subway.jpg
	report/suv.jpg
	report/sylvester.jpg
	report/tiger1.jpg
	report/tiger2.jpg
	report/trellis.jpg
	report/walking.jpg
	report/walking2.jpg
	report/woman.jpg