Starting BC calculations; gives wrong answer
- reimplement betweenness centrality using boost methods
- code clean
Merge branch 'betweenness'
Fix valgrind complaints about memory leaks
Merge pull request #29 from jdlschrock/master

Adding power law fitting from jdlschrock
Merge remote branch 'upstream/master' into merge_test

Conflicts:
	util/src/graph_stats.cpp