Better parsing and new test script.
Updated data with the latest posted set.
Adds a density function and a LocalSearch approach.
Fix the documentation.
Merge new data sets branch 'master' of https://github.com/genghis88/DensestSubgraphProblem

Conflicts:
	data/input_10.txt
	data/input_4.txt
	data/param_11.txt
	data/problem0_param_0.txt
	data/problem0_param_1.txt
	data/problem0_param_2.txt
	data/problem1_param_0.txt
	data/problem1_param_1.txt
	data/problem1_param_2.txt
	data/problem2_input_0.txt
	data/problem2_param_2.txt
	data/problem3_input_0.txt
	data/problem3_param_0.txt
	data/problem3_param_1.txt
	data/problem3_param_2.txt
	src/hps/nyu/fa14/Matrix.java
Add back the necessary data files.
Fixed testing script.
Merge branch 'master' of https://github.com/genghis88/DensestSubgraphProblem
Bugs fixed
Merge branch 'master' of https://github.com/ck1456/DensestSubgraphProblem